diff --git a/share/qtcreator/themes/dark.creatortheme b/share/qtcreator/themes/dark.creatortheme
index e538150cd1a..cfb41b608bb 100644
--- a/share/qtcreator/themes/dark.creatortheme
+++ b/share/qtcreator/themes/dark.creatortheme
@@ -185,6 +185,7 @@ DrawSearchResultWidgetFrame=false
 DrawTargetSelectorBottom=false
 DrawToolBarHighlights=true
 ApplyThemePaletteGlobally=true
+FlatToolBars=true
 FlatSideBarIcons=true
 FlatProjectsMode=true
 FlatMenuBar=true
@@ -208,6 +209,3 @@ BuildStepDisable=:/projectexplorer/images/lightdisabledbuildstep.png
 BuildStepRemove=:/core/images/lightclose.png
 BuildStepMoveDown=:/core/images/lightarrowdown.png
 BuildStepMoveUp=:/core/images/lightarrowup.png
-
-[Style]
-WidgetStyle=StyleFlat
diff --git a/share/qtcreator/themes/default.creatortheme b/share/qtcreator/themes/default.creatortheme
index 441326bb614..ede12f035de 100644
--- a/share/qtcreator/themes/default.creatortheme
+++ b/share/qtcreator/themes/default.creatortheme
@@ -179,6 +179,7 @@ DrawSearchResultWidgetFrame=true
 DrawTargetSelectorBottom=true
 DrawToolBarHighlights=true
 ApplyThemePaletteGlobally=false
+FlatToolBars=false
 FlatSideBarIcons=false
 FlatProjectsMode=false
 FlatMenuBar=false
@@ -188,6 +189,3 @@ ToolBarIconShadow=true
 DetailsWidgetHeaderGradient\1\color=ffffff
 DetailsWidgetHeaderGradient\1\pos=1
 DetailsWidgetHeaderGradient\size=1
-
-[Style]
-WidgetStyle=StyleDefault
diff --git a/share/qtcreator/themes/flat.creatortheme b/share/qtcreator/themes/flat.creatortheme
index 0ba0b6fc18e..b9bf2c898ad 100644
--- a/share/qtcreator/themes/flat.creatortheme
+++ b/share/qtcreator/themes/flat.creatortheme
@@ -189,6 +189,7 @@ DrawSearchResultWidgetFrame=false
 DrawTargetSelectorBottom=false
 DrawToolBarHighlights=false
 ApplyThemePaletteGlobally=false
+FlatToolBars=true
 FlatSideBarIcons=true
 FlatProjectsMode=false
 FlatMenuBar=false
@@ -198,6 +199,3 @@ ToolBarIconShadow=true
 DetailsWidgetHeaderGradient\1\color=0
 DetailsWidgetHeaderGradient\1\pos=1
 DetailsWidgetHeaderGradient\size=1
-
-[Style]
-WidgetStyle=StyleFlat
diff --git a/src/libs/utils/theme/theme.cpp b/src/libs/utils/theme/theme.cpp
index a180acf3acd..cf730739c37 100644
--- a/src/libs/utils/theme/theme.cpp
+++ b/src/libs/utils/theme/theme.cpp
@@ -39,7 +39,6 @@ namespace Utils {
 static Theme *m_creatorTheme = 0;
 
 ThemePrivate::ThemePrivate()
-    : widgetStyle(Theme::StyleDefault)
 {
     const QMetaObject &m = Theme::staticMetaObject;
     colors.resize        (m.enumerator(m.indexOfEnumerator("Color")).keyCount());
@@ -73,11 +72,6 @@ Theme::~Theme()
     delete d;
 }
 
-Theme::WidgetStyle Theme::widgetStyle() const
-{
-    return d->widgetStyle;
-}
-
 QStringList Theme::preferredStyles() const
 {
     return d->preferredStyles;
@@ -164,10 +158,6 @@ QVariantHash Theme::values() const
             result.insert(key, flag(static_cast<Theme::Flag>(i)));
         }
     }
-    {
-        const QMetaEnum e = m.enumerator(m.indexOfEnumerator("WidgetStyle"));
-        result.insert(QLatin1String("WidgetStyle"), QLatin1String(e.valueToKey(widgetStyle())));
-    }
     return result;
 }
 
@@ -198,13 +188,6 @@ void Theme::readSettings(QSettings &settings)
         }
         settings.endGroup();
     }
-    {
-        settings.beginGroup(QLatin1String("Style"));
-        QMetaEnum e = m.enumerator(m.indexOfEnumerator("WidgetStyle"));
-        QString val = settings.value(QLatin1String("WidgetStyle")).toString();
-        d->widgetStyle = static_cast<Theme::WidgetStyle>(e.keysToValue (val.toLatin1().data()));
-        settings.endGroup();
-    }
     {
         settings.beginGroup(QLatin1String("Colors"));
         QMetaEnum e = m.enumerator(m.indexOfEnumerator("Color"));
diff --git a/src/libs/utils/theme/theme.h b/src/libs/utils/theme/theme.h
index b7e3ea6a444..e4a53620489 100644
--- a/src/libs/utils/theme/theme.h
+++ b/src/libs/utils/theme/theme.h
@@ -272,18 +272,13 @@ public:
         ComboBoxDrawTextShadow,
         DerivePaletteFromTheme,
         ApplyThemePaletteGlobally,
+        FlatToolBars,
         FlatSideBarIcons,
         FlatProjectsMode,
         FlatMenuBar,
         ToolBarIconShadow
     };
 
-    enum WidgetStyle {
-        StyleDefault,
-        StyleFlat
-    };
-
-    WidgetStyle widgetStyle() const;
     bool flag(Flag f) const;
     QColor color(Color role) const;
     QString imageFile(ImageFile imageFile, const QString &fallBack) const;
diff --git a/src/libs/utils/theme/theme_p.h b/src/libs/utils/theme/theme_p.h
index 8dafe9db57e..4170ec7cd9f 100644
--- a/src/libs/utils/theme/theme_p.h
+++ b/src/libs/utils/theme/theme_p.h
@@ -47,7 +47,6 @@ public:
     QVector<QString> imageFiles;
     QVector<QGradientStops> gradients;
     QVector<bool> flags;
-    Theme::WidgetStyle widgetStyle;
     QMap<QString, QColor> palette;
 };
 
diff --git a/src/plugins/coreplugin/editormanager/editorview.cpp b/src/plugins/coreplugin/editormanager/editorview.cpp
index 2129740d19d..059bf7cd1ff 100644
--- a/src/plugins/coreplugin/editormanager/editorview.cpp
+++ b/src/plugins/coreplugin/editormanager/editorview.cpp
@@ -291,14 +291,14 @@ void EditorView::paintEvent(QPaintEvent *)
     QPainter painter(this);
 
     QRect rect = m_container->geometry();
-    if (creatorTheme()->widgetStyle() == Theme::StyleDefault) {
+    if (creatorTheme()->flag(Theme::FlatToolBars)) {
+        painter.fillRect(rect, creatorTheme()->color(Theme::EditorPlaceholderColor));
+    } else {
         painter.setRenderHint(QPainter::Antialiasing, true);
         painter.setPen(Qt::NoPen);
         painter.setBrush(creatorTheme()->color(Theme::EditorPlaceholderColor));
         const int r = 3;
         painter.drawRoundedRect(rect.adjusted(r , r, -r, -r), r * 2, r * 2);
-    } else {
-        painter.fillRect(rect, creatorTheme()->color(Theme::EditorPlaceholderColor));
     }
 }
 
diff --git a/src/plugins/coreplugin/fancyactionbar.cpp b/src/plugins/coreplugin/fancyactionbar.cpp
index b527431d00e..14d3868f9cf 100644
--- a/src/plugins/coreplugin/fancyactionbar.cpp
+++ b/src/plugins/coreplugin/fancyactionbar.cpp
@@ -145,20 +145,22 @@ void FancyToolButton::paintEvent(QPaintEvent *event)
     if (!HostOsInfo::isMacHost() // Mac UIs usually don't hover
             && m_fader > 0 && isEnabled() && !isDown() && !isChecked()) {
         painter.save();
-        if (creatorTheme()->widgetStyle() == Theme::StyleDefault) {
-            painter.setOpacity(m_fader);
-            FancyToolButton::hoverOverlay(&painter, rect());
-        } else {
+        if (creatorTheme()->flag(Theme::FlatToolBars)) {
             const QColor hoverColor = creatorTheme()->color(Theme::FancyToolButtonHoverColor);
             QColor fadedHoverColor = hoverColor;
             fadedHoverColor.setAlpha(int(m_fader * hoverColor.alpha()));
             painter.fillRect(rect(), fadedHoverColor);
+        } else {
+            painter.setOpacity(m_fader);
+            FancyToolButton::hoverOverlay(&painter, rect());
         }
         painter.restore();
     } else if (isDown() || isChecked()) {
         painter.save();
         const QColor selectedColor = creatorTheme()->color(Theme::FancyToolButtonSelectedColor);
-        if (creatorTheme()->widgetStyle() == Theme::StyleDefault) {
+        if (creatorTheme()->flag(Theme::FlatToolBars)) {
+            painter.fillRect(rect(), selectedColor);
+        } else {
             QLinearGradient grad(rect().topLeft(), rect().topRight());
             grad.setColorAt(0, Qt::transparent);
             grad.setColorAt(0.5, selectedColor);
@@ -171,8 +173,6 @@ void FancyToolButton::paintEvent(QPaintEvent *event)
             painter.drawLine(borderRectF.topLeft() + QPointF(0, 1), borderRectF.topRight() + QPointF(0, 1));
             painter.drawLine(borderRectF.bottomLeft(), borderRectF.bottomRight());
             painter.drawLine(borderRectF.bottomLeft(), borderRectF.bottomRight());
-        } else {
-            painter.fillRect(rect(), selectedColor);
         }
         painter.restore();
     }
@@ -269,7 +269,7 @@ void FancyActionBar::paintEvent(QPaintEvent *event)
 {
     QPainter painter(this);
     const QRectF borderRect = QRectF(rect()).adjusted(0.5, 0.5, -0.5, -0.5);
-    if (creatorTheme()->widgetStyle () == Theme::StyleFlat) {
+    if (creatorTheme()->flag(Theme::FlatToolBars)) {
         // this paints the background of the bottom portion of the
         // left tab bar
         painter.fillRect(event->rect(), StyleHelper::baseColor());
diff --git a/src/plugins/coreplugin/fancytabwidget.cpp b/src/plugins/coreplugin/fancytabwidget.cpp
index 925efb4b285..3c8d4219c82 100644
--- a/src/plugins/coreplugin/fancytabwidget.cpp
+++ b/src/plugins/coreplugin/fancytabwidget.cpp
@@ -114,7 +114,7 @@ QSize FancyTabBar::tabSizeHint(bool minimum) const
 void FancyTabBar::paintEvent(QPaintEvent *event)
 {
     QPainter p(this);
-    if (creatorTheme()->widgetStyle() == Theme::StyleFlat) {
+    if (creatorTheme()->flag(Theme::FlatToolBars)) {
         // draw background of upper part of left tab widget
         // (Welcome, ... Help)
         p.fillRect(event->rect(), StyleHelper::baseColor());
@@ -293,7 +293,7 @@ void FancyTabBar::paintTab(QPainter *painter, int tabIndex) const
     bool enabled = isTabEnabled(tabIndex);
 
     if (selected) {
-        if (creatorTheme()->widgetStyle() == Theme::StyleFlat) {
+        if (creatorTheme()->flag(Theme::FlatToolBars)) {
           // background color of a fancy tab that is active
           painter->fillRect(rect, creatorTheme()->color(Theme::FancyToolButtonSelectedColor));
         } else {
@@ -317,14 +317,14 @@ void FancyTabBar::paintTab(QPainter *painter, int tabIndex) const
     if (fader > 0 && !HostOsInfo::isMacHost() && !selected && enabled) {
         painter->save();
         painter->setOpacity(fader);
-        if (creatorTheme()->widgetStyle() == Theme::StyleFlat)
+        if (creatorTheme()->flag(Theme::FlatToolBars))
             painter->fillRect(rect, creatorTheme()->color(Theme::FancyToolButtonHoverColor));
         else
             FancyToolButton::hoverOverlay(painter, rect);
         painter->restore();
     }
 
-    if (!enabled && creatorTheme()->widgetStyle() == Theme::StyleDefault)
+    if (!enabled && !creatorTheme()->flag(Theme::FlatToolBars))
         painter->setOpacity(0.7);
 
     if (drawIcon) {
diff --git a/src/plugins/coreplugin/manhattanstyle.cpp b/src/plugins/coreplugin/manhattanstyle.cpp
index c90ef20eab3..95ee18266bb 100644
--- a/src/plugins/coreplugin/manhattanstyle.cpp
+++ b/src/plugins/coreplugin/manhattanstyle.cpp
@@ -455,7 +455,13 @@ void ManhattanStyle::drawPrimitive(PrimitiveElement element, const QStyleOption
             // Fill the line edit background
             QRectF backgroundRect = option->rect;
             const bool enabled = option->state & State_Enabled;
-            if (Utils::creatorTheme()->widgetStyle() == Utils::Theme::StyleDefault) {
+            if (Utils::creatorTheme()->flag(Theme::FlatToolBars)) {
+                painter->save();
+                if (!enabled)
+                    painter->setOpacity(0.75);
+                painter->fillRect(backgroundRect, option->palette.base());
+                painter->restore();
+            } else {
                 backgroundRect.adjust(1, 1, -1, -1);
                 painter->setBrushOrigin(backgroundRect.topLeft());
                 painter->fillRect(backgroundRect, option->palette.base());
@@ -467,12 +473,6 @@ void ManhattanStyle::drawPrimitive(PrimitiveElement element, const QStyleOption
 
                 StyleHelper::drawCornerImage(enabled ? bg : bg_disabled,
                                              painter, option->rect, 5, 5, 5, 5);
-            } else {
-                painter->save();
-                if (!enabled)
-                    painter->setOpacity(0.75);
-                painter->fillRect(backgroundRect, option->palette.base());
-                painter->restore();
             }
 
             const bool hasFocus = state & State_HasFocus;
@@ -499,7 +499,7 @@ void ManhattanStyle::drawPrimitive(PrimitiveElement element, const QStyleOption
                 if (pressed) {
                     const QColor shade = creatorTheme()->color(Theme::FancyToolButtonSelectedColor);
                     painter->fillRect(rect, shade);
-                    if (creatorTheme()->widgetStyle() == Theme::StyleDefault) {
+                    if (!creatorTheme()->flag(Theme::FlatToolBars)) {
                         const QRectF borderRect = QRectF(rect).adjusted(0.5, 0.5, -0.5, -0.5);
                         painter->drawLine(borderRect.topLeft() + QPointF(1, 0), borderRect.topRight() - QPointF(1, 0));
                         painter->drawLine(borderRect.topLeft(), borderRect.bottomLeft());
@@ -527,7 +527,9 @@ void ManhattanStyle::drawPrimitive(PrimitiveElement element, const QStyleOption
 
     case PE_PanelStatusBar:
         {
-            if (creatorTheme()->widgetStyle() == Theme::StyleDefault) {
+            if (creatorTheme()->flag(Theme::FlatToolBars)) {
+                painter->fillRect(rect, StyleHelper::baseColor());
+            } else {
                 painter->save();
                 QLinearGradient grad = StyleHelper::statusBarGradient(rect);
                 painter->fillRect(rect, grad);
@@ -538,8 +540,6 @@ void ManhattanStyle::drawPrimitive(PrimitiveElement element, const QStyleOption
                 painter->setPen(StyleHelper::borderColor().darker(110)); //TODO: make themable
                 painter->drawLine(borderRect.topLeft(), borderRect.topRight());
                 painter->restore();
-            } else {
-                painter->fillRect(rect, StyleHelper::baseColor());
             }
         }
         break;
@@ -819,7 +819,7 @@ void ManhattanStyle::drawControl(ControlElement element, const QStyleOption *opt
 
             bool drawLightColored = lightColored(widget);
             // draws the background of the 'Type hierarchy', 'Projects' headers
-            if (creatorTheme()->widgetStyle() == Theme::StyleFlat)
+            if (creatorTheme()->flag(Theme::FlatToolBars))
                 painter->fillRect(rect, StyleHelper::baseColor(drawLightColored));
             else if (horizontal)
                 StyleHelper::horizontalGradient(painter, gradientSpan, rect, drawLightColored);
@@ -836,9 +836,9 @@ void ManhattanStyle::drawControl(ControlElement element, const QStyleOption *opt
                     // Note: This is a hack to determine if the
                     // toolbar should draw the top or bottom outline
                     // (needed for the find toolbar for instance)
-                    const QColor hightLight = creatorTheme()->widgetStyle() == Theme::StyleDefault
-                            ? StyleHelper::sidebarHighlight()
-                            : creatorTheme()->color(Theme::FancyToolBarSeparatorColor);
+                    const QColor hightLight = creatorTheme()->flag(Theme::FlatToolBars)
+                            ? creatorTheme()->color(Theme::FancyToolBarSeparatorColor)
+                            : StyleHelper::sidebarHighlight();
                     const QColor borderColor = drawLightColored
                             ? QColor(255, 255, 255, 180) : hightLight;
                     if (widget && widget->property("topBorder").toBool()) {
@@ -1017,7 +1017,7 @@ void ManhattanStyle::drawComplexControl(ComplexControl control, const QStyleOpti
 void ManhattanStyle::drawButtonSeparator(QPainter *painter, const QRect &rect, bool reverse) const
 {
     const QRectF borderRect = QRectF(rect).adjusted(0.5, 0.5, -0.5, -0.5);
-    if (creatorTheme()->widgetStyle() == Theme::StyleFlat) {
+    if (creatorTheme()->flag(Theme::FlatToolBars)) {
         const int margin = 3;
         painter->setPen(creatorTheme()->color(Theme::FancyToolBarSeparatorColor));
         painter->drawLine(borderRect.topRight() + QPointF(0, margin),
diff --git a/src/plugins/coreplugin/outputpanemanager.cpp b/src/plugins/coreplugin/outputpanemanager.cpp
index 07e234fbf9d..25ae1277108 100644
--- a/src/plugins/coreplugin/outputpanemanager.cpp
+++ b/src/plugins/coreplugin/outputpanemanager.cpp
@@ -76,7 +76,7 @@ static const int buttonBorderWidth = 3;
 
 static int numberAreaWidth()
 {
-    return creatorTheme()->widgetStyle() == Theme::StyleDefault ? 19 : 15;
+    return creatorTheme()->flag(Theme::FlatToolBars) ? 15 : 19;
 }
 
 ////
@@ -192,7 +192,7 @@ OutputPaneManager::OutputPaneManager(QWidget *parent) :
     m_buttonsWidget->setLayout(new QHBoxLayout);
     m_buttonsWidget->layout()->setContentsMargins(5,0,0,0);
     m_buttonsWidget->layout()->setSpacing(
-            creatorTheme()->widgetStyle() == Theme::StyleDefault ? 4 : 9);
+            creatorTheme()->flag(Theme::FlatToolBars) ? 9 : 4);
 }
 
 OutputPaneManager::~OutputPaneManager()
@@ -687,16 +687,7 @@ void OutputPaneToggleButton::paintEvent(QPaintEvent*)
     const bool hovered = !HostOsInfo::isMacHost() && (styleOption.state & QStyle::State_MouseOver);
 
     const QImage *image = 0;
-    if (creatorTheme()->widgetStyle() == Theme::StyleDefault) {
-        if (isDown())
-            image = &panelButtonPressed;
-        else if (isChecked())
-            image = hovered ? &panelButtonCheckedHover : &panelButtonChecked;
-        else
-            image = hovered ? &panelButtonHover : &panelButton;
-        if (image)
-            StyleHelper::drawCornerImage(*image, &p, rect(), numberAreaWidth(), buttonBorderWidth, buttonBorderWidth, buttonBorderWidth);
-    } else {
+    if (creatorTheme()->flag(Theme::FlatToolBars)) {
         Theme::Color c = Theme::BackgroundColorDark;
 
         if (hovered)
@@ -706,13 +697,22 @@ void OutputPaneToggleButton::paintEvent(QPaintEvent*)
 
         if (c != Theme::BackgroundColorDark)
             p.fillRect(rect(), creatorTheme()->color(c));
+    } else {
+        if (isDown())
+            image = &panelButtonPressed;
+        else if (isChecked())
+            image = hovered ? &panelButtonCheckedHover : &panelButtonChecked;
+        else
+            image = hovered ? &panelButtonHover : &panelButton;
+        if (image)
+            StyleHelper::drawCornerImage(*image, &p, rect(), numberAreaWidth(), buttonBorderWidth, buttonBorderWidth, buttonBorderWidth);
     }
 
     if (m_flashTimer->state() == QTimeLine::Running)
     {
         QColor c = creatorTheme()->color(Theme::OutputPaneButtonFlashColor);
         c.setAlpha (m_flashTimer->currentFrame());
-        QRect r = (creatorTheme()->widgetStyle() == Theme::StyleFlat)
+        QRect r = creatorTheme()->flag(Theme::FlatToolBars)
                   ? rect() : rect().adjusted(numberAreaWidth(), 1, -1, -1);
         p.fillRect(r, c);
     }
@@ -781,7 +781,7 @@ QSize OutputPaneManageButton::sizeHint() const
 void OutputPaneManageButton::paintEvent(QPaintEvent*)
 {
     QPainter p(this);
-    if (creatorTheme()->widgetStyle() == Theme::StyleDefault) {
+    if (!creatorTheme()->flag(Theme::FlatToolBars)) {
         static const QImage button(StyleHelper::dpiSpecificImageFile(QStringLiteral(":/core/images/panel_manage_button.png")));
         StyleHelper::drawCornerImage(button, &p, rect(), buttonBorderWidth, buttonBorderWidth, buttonBorderWidth, buttonBorderWidth);
     }
diff --git a/src/plugins/coreplugin/progressmanager/futureprogress.cpp b/src/plugins/coreplugin/progressmanager/futureprogress.cpp
index dd1a9bf59f7..938570c5e4f 100644
--- a/src/plugins/coreplugin/progressmanager/futureprogress.cpp
+++ b/src/plugins/coreplugin/progressmanager/futureprogress.cpp
@@ -295,7 +295,7 @@ void FutureProgress::mousePressEvent(QMouseEvent *event)
 void FutureProgress::paintEvent(QPaintEvent *)
 {
     QPainter p(this);
-    if (creatorTheme()->widgetStyle() == Theme::StyleFlat) {
+    if (creatorTheme()->flag(Theme::FlatToolBars)) {
         p.fillRect(rect(), StyleHelper::baseColor());
     } else {
       QLinearGradient grad = StyleHelper::statusBarGradient(rect());
diff --git a/src/plugins/coreplugin/progressmanager/progressbar.cpp b/src/plugins/coreplugin/progressmanager/progressbar.cpp
index 13481968939..751e221fd7f 100644
--- a/src/plugins/coreplugin/progressmanager/progressbar.cpp
+++ b/src/plugins/coreplugin/progressmanager/progressbar.cpp
@@ -295,7 +295,7 @@ void ProgressBar::paintEvent(QPaintEvent *)
     const QColor c = creatorTheme()->color(themeColor);
 
     //draw the progress bar
-    if (creatorTheme()->widgetStyle() == Theme::StyleFlat) {
+    if (creatorTheme()->flag(Theme::FlatToolBars)) {
         p.fillRect(rect.adjusted(2, 2, -2, -2),
                    creatorTheme()->color(Theme::ProgressBarBackgroundColor));
         p.fillRect(inner, c);
@@ -336,7 +336,7 @@ void ProgressBar::paintEvent(QPaintEvent *)
             const bool hover = m_cancelRect.contains(mapFromGlobal(QCursor::pos()));
             const QRectF cancelVisualRect(m_cancelRect.adjusted(0, 1, -2, -2));
             int intensity = hover ? 90 : 70;
-            if (creatorTheme()->widgetStyle() != Theme::StyleFlat) {
+            if (!creatorTheme()->flag(Theme::FlatToolBars)) {
                 QLinearGradient grad(cancelVisualRect.topLeft(), cancelVisualRect.bottomLeft());
                 QColor buttonColor(intensity, intensity, intensity, 255);
                 grad.setColorAt(0, buttonColor.lighter(130));
diff --git a/src/plugins/coreplugin/progressmanager/progressmanager.cpp b/src/plugins/coreplugin/progressmanager/progressmanager.cpp
index 2533e706052..9254997c18a 100644
--- a/src/plugins/coreplugin/progressmanager/progressmanager.cpp
+++ b/src/plugins/coreplugin/progressmanager/progressmanager.cpp
@@ -708,7 +708,7 @@ ToggleButton::ToggleButton(QWidget *parent)
     : QToolButton(parent)
 {
     setToolButtonStyle(Qt::ToolButtonIconOnly);
-    if (creatorTheme()->widgetStyle() == Theme::StyleFlat) {
+    if (creatorTheme()->flag(Theme::FlatToolBars)) {
         QPalette p = palette();
         p.setBrush(QPalette::Base, creatorTheme()->color(Theme::ToggleButtonBackgroundColor));
         setPalette(p);
diff --git a/src/plugins/projectexplorer/miniprojecttargetselector.cpp b/src/plugins/projectexplorer/miniprojecttargetselector.cpp
index f4bef004843..035c5eaa120 100644
--- a/src/plugins/projectexplorer/miniprojecttargetselector.cpp
+++ b/src/plugins/projectexplorer/miniprojecttargetselector.cpp
@@ -135,7 +135,7 @@ void TargetSelectorDelegate::paint(QPainter *painter,
         const QColor color = (option.state & QStyle::State_HasFocus) ?
                     option.palette.highlight().color() :
                     option.palette.dark().color();
-        if (creatorTheme()->widgetStyle() == Theme::StyleFlat) {
+        if (creatorTheme()->flag(Theme::FlatToolBars)) {
             painter->fillRect(option.rect, color);
         } else {
             painter->fillRect(option.rect, color.darker(140));
diff --git a/src/plugins/projectexplorer/panelswidget.cpp b/src/plugins/projectexplorer/panelswidget.cpp
index ee587f889f8..25b10b8a9a3 100644
--- a/src/plugins/projectexplorer/panelswidget.cpp
+++ b/src/plugins/projectexplorer/panelswidget.cpp
@@ -85,7 +85,7 @@ void RootWidget::paintEvent(QPaintEvent *e)
 {
     QWidget::paintEvent(e);
 
-    if (creatorTheme()->widgetStyle() == Theme::StyleDefault) {
+    if (!creatorTheme()->flag(Theme::FlatToolBars)) {
         // draw separator line to the right of the settings panel
         QPainter painter(this);
         QColor light = StyleHelper::mergedColors(
diff --git a/src/plugins/qmldesigner/components/navigator/navigatortreeview.cpp b/src/plugins/qmldesigner/components/navigator/navigatortreeview.cpp
index 72de3a7cd0d..94dab63cd76 100644
--- a/src/plugins/qmldesigner/components/navigator/navigatortreeview.cpp
+++ b/src/plugins/qmldesigner/components/navigator/navigatortreeview.cpp
@@ -170,7 +170,7 @@ NavigatorTreeView::NavigatorTreeView(QWidget *parent)
 void NavigatorTreeView::drawSelectionBackground(QPainter *painter, const QStyleOption &option)
 {
     painter->save();
-    if (Utils::creatorTheme()->widgetStyle() == Utils::Theme::StyleFlat) {
+    if (Utils::creatorTheme()->flag(Utils::Theme::FlatToolBars)) {
         painter->setOpacity(0.5);
         painter->fillRect(option.rect, option.palette.color(QPalette::Highlight));
     } else {