diff --git a/src/plugins/coreplugin/icore.cpp b/src/plugins/coreplugin/icore.cpp
index 3550d827bdd..c1684cefd7d 100644
--- a/src/plugins/coreplugin/icore.cpp
+++ b/src/plugins/coreplugin/icore.cpp
@@ -34,6 +34,8 @@
 #include <app/app_version.h>
 #include <extensionsystem/pluginmanager.h>
 
+#include <utils/qtcassert.h>
+
 #include <QSysInfo>
 #include <QApplication>
 
@@ -283,6 +285,7 @@
     specified by \a additionalContexts changed.
 */
 
+#include "dialogs/newdialog.h"
 #include "mainwindow.h"
 #include "documentmanager.h"
 
@@ -301,6 +304,7 @@ namespace Core {
 // The Core Singleton
 static ICore *m_instance = 0;
 static MainWindow *m_mainwindow;
+static bool m_isNewItemDialogRunning = false;
 
 ICore *ICore::instance()
 {
@@ -309,7 +313,7 @@ ICore *ICore::instance()
 
 bool ICore::isNewItemDialogRunning()
 {
-    return m_mainwindow->isNewItemDialogRunning();
+    return m_isNewItemDialogRunning;
 }
 
 ICore::ICore(MainWindow *mainwindow)
@@ -334,7 +338,14 @@ void ICore::showNewItemDialog(const QString &title,
                               const QString &defaultLocation,
                               const QVariantMap &extraVariables)
 {
-    m_mainwindow->showNewItemDialog(title, factories, defaultLocation, extraVariables);
+    QTC_ASSERT(!m_isNewItemDialogRunning, return);
+    auto newDialog = new NewDialog(dialogParent());
+    connect(newDialog, &QObject::destroyed, &ICore::newItemDialogClosed);
+    newDialog->setWizardFactories(factories, defaultLocation, extraVariables);
+    newDialog->setWindowTitle(title);
+    newDialog->showDialog();
+
+    newItemDialogOpened();
 }
 
 bool ICore::showOptionsDialog(const Id page, QWidget *parent)
@@ -541,4 +552,16 @@ void ICore::saveSettings()
     ICore::settings(QSettings::UserScope)->sync();
 }
 
+void ICore::newItemDialogOpened()
+{
+    m_isNewItemDialogRunning = true;
+    emit instance()->newItemDialogRunningChanged();
+}
+
+void ICore::newItemDialogClosed()
+{
+    m_isNewItemDialogRunning = false;
+    emit instance()->newItemDialogRunningChanged();
+}
+
 } // namespace Core
diff --git a/src/plugins/coreplugin/icore.h b/src/plugins/coreplugin/icore.h
index 61df88c61b2..bfce69a068d 100644
--- a/src/plugins/coreplugin/icore.h
+++ b/src/plugins/coreplugin/icore.h
@@ -136,6 +136,10 @@ signals:
     void contextAboutToChange(const QList<Core::IContext *> &context);
     void contextChanged(const QList<Core::IContext *> &context, const Core::Context &additionalContexts);
     void themeChanged();
+
+private:
+    static void newItemDialogOpened();
+    static void newItemDialogClosed();
 };
 
 } // namespace Core
diff --git a/src/plugins/coreplugin/mainwindow.cpp b/src/plugins/coreplugin/mainwindow.cpp
index 7d7953cd179..8dce1974c50 100644
--- a/src/plugins/coreplugin/mainwindow.cpp
+++ b/src/plugins/coreplugin/mainwindow.cpp
@@ -237,11 +237,6 @@ void MainWindow::setOverrideColor(const QColor &color)
     m_overrideColor = color;
 }
 
-bool MainWindow::isNewItemDialogRunning() const
-{
-    return !m_newDialog.isNull();
-}
-
 MainWindow::~MainWindow()
 {
     // explicitly delete window support, because that calls methods from ICore that call methods
@@ -492,7 +487,13 @@ void MainWindow::registerDefaultActions()
     cmd = ActionManager::registerAction(m_newAction, Constants::NEW);
     cmd->setDefaultKeySequence(QKeySequence::New);
     mfile->addAction(cmd, Constants::G_FILE_NEW);
-    connect(m_newAction, SIGNAL(triggered()), this, SLOT(newFile()));
+    connect(m_newAction, &QAction::triggered, this, []() {
+        ICore::showNewItemDialog(tr("New File or Project", "Title of dialog"),
+                                 IWizardFactory::allWizardFactories(), QString());
+    });
+    connect(ICore::instance(), &ICore::newItemDialogRunningChanged, m_newAction, [this]() {
+        m_newAction->setEnabled(!ICore::isNewItemDialogRunning());
+    });
 
     // Open Action
     icon = QIcon::fromTheme(QLatin1String("document-open"), QIcon(QLatin1String(Constants::ICON_OPENFILE)));
@@ -732,11 +733,6 @@ void MainWindow::registerDefaultActions()
     }
 }
 
-void MainWindow::newFile()
-{
-    showNewItemDialog(tr("New File or Project", "Title of dialog"), IWizardFactory::allWizardFactories(), QString());
-}
-
 void MainWindow::openFile()
 {
     openFiles(EditorManager::getOpenFileNames(), ICore::SwitchMode);
@@ -813,21 +809,6 @@ void MainWindow::setFocusToEditor()
     EditorManagerPrivate::doEscapeKeyFocusMoveMagic();
 }
 
-void MainWindow::showNewItemDialog(const QString &title,
-                                          const QList<IWizardFactory *> &factories,
-                                          const QString &defaultLocation,
-                                          const QVariantMap &extraVariables)
-{
-    QTC_ASSERT(!m_newDialog, return);
-    m_newAction->setEnabled(false);
-    m_newDialog = new NewDialog(this);
-    connect(m_newDialog.data(), SIGNAL(destroyed()), this, SLOT(newItemDialogFinished()));
-    m_newDialog->setWizardFactories(factories, defaultLocation, extraVariables);
-    m_newDialog->setWindowTitle(title);
-    m_newDialog->showDialog();
-    emit newItemDialogRunningChanged();
-}
-
 bool MainWindow::showOptionsDialog(Id page, QWidget *parent)
 {
     emit m_coreImpl->optionsDialogRequested();
diff --git a/src/plugins/coreplugin/mainwindow.h b/src/plugins/coreplugin/mainwindow.h
index 6f047ca9041..516c3156f31 100644
--- a/src/plugins/coreplugin/mainwindow.h
+++ b/src/plugins/coreplugin/mainwindow.h
@@ -33,7 +33,6 @@
 
 #include "icontext.h"
 #include "icore.h"
-#include "dialogs/newdialog.h"
 
 #include <utils/appmainwindow.h>
 #include <utils/fileutils.h>
@@ -109,21 +108,13 @@ public:
 
     void setOverrideColor(const QColor &color);
 
-    bool isNewItemDialogRunning() const;
-
 signals:
     void newItemDialogRunningChanged();
 
 public slots:
-    void newFile();
     void openFileWith();
     void exit();
 
-    void showNewItemDialog(const QString &title,
-                           const QList<IWizardFactory *> &factories,
-                           const QString &defaultLocation = QString(),
-                           const QVariantMap &extraVariables = QVariantMap());
-
     bool showOptionsDialog(Id page = Id(), QWidget *parent = 0);
 
     bool showWarningWithOptions(const QString &title, const QString &text,
@@ -177,7 +168,6 @@ private:
     RightPaneWidget *m_rightPaneWidget;
     StatusBarWidget *m_outputView;
     VersionDialog *m_versionDialog;
-    QPointer<NewDialog> m_newDialog;
 
     QList<IContext *> m_activeContext;