diff --git a/README.md b/README.md
index d4ae02c..7b30737 100644
--- a/README.md
+++ b/README.md
@@ -54,6 +54,7 @@ of his docking system project.
   - [Qt Creator IDE](#qt-creator-ide)
   - [Qt Design Studio](#qt-design-studio)
   - [QmixElements](#qmixelements)
+  - [ezEditor](#ezeditor)
 
 ### Docking everywhere - no central widget
 
@@ -304,3 +305,11 @@ plugin-based and modular laboratory automation software for controlling CETONI d
 Advanced Docking System in the QmixElements sofware.
 
 ![QmixElements](doc/qmix_elements.png)
+
+### [ezEditor](https://github.com/ezEngine/ezEngine)
+
+The ezEditor is a full blown graphical editor used for editing scenes and
+importing and authoring assets for the [ezEngine](https://github.com/ezEngine/ezEngine) -
+an open source C++ game engine in active development.
+
+![ezEditor](doc/ezEngine_editor.png)
diff --git a/demo/StatusDialog.h b/demo/StatusDialog.h
index 07d82bd..977fe82 100644
--- a/demo/StatusDialog.h
+++ b/demo/StatusDialog.h
@@ -23,7 +23,7 @@ class CStatusDialog : public QDialog
 	Q_OBJECT
 private:
 	StatusDialogPrivate* d; ///< private data (pimpl)
-	friend class StatusDialogPrivate;
+    friend struct StatusDialogPrivate;
 
 private slots:
 	void on_dockWidgetsComboBox_currentIndexChanged(int index);
diff --git a/doc/ezEngine_editor.png b/doc/ezEngine_editor.png
new file mode 100644
index 0000000..98df567
Binary files /dev/null and b/doc/ezEngine_editor.png differ
diff --git a/examples/sidebar/MainWindow.h b/examples/sidebar/MainWindow.h
index bb6148f..5e2cd8c 100644
--- a/examples/sidebar/MainWindow.h
+++ b/examples/sidebar/MainWindow.h
@@ -4,10 +4,11 @@
 #include <QMainWindow>
 #include "DockManager.h"
 
+QT_BEGIN_NAMESPACE
 namespace Ui {
 class MainWindow;
 }
-
+QT_END_NAMESPACE
 
 /**
  * This example shows, how to place a dock widget container and a static
diff --git a/examples/simple/MainWindow.h b/examples/simple/MainWindow.h
index 462d4f6..8d90885 100644
--- a/examples/simple/MainWindow.h
+++ b/examples/simple/MainWindow.h
@@ -4,9 +4,11 @@
 #include <QMainWindow>
 #include "DockManager.h"
 
+QT_BEGIN_NAMESPACE
 namespace Ui {
 class MainWindow;
 }
+QT_END_NAMESPACE
 
 class MainWindow : public QMainWindow
 {
diff --git a/src/DockAreaTitleBar.h b/src/DockAreaTitleBar.h
index 2a4505f..426e07a 100644
--- a/src/DockAreaTitleBar.h
+++ b/src/DockAreaTitleBar.h
@@ -34,7 +34,7 @@
 
 #include "ads_globals.h"
 
-class QAbstractButton;
+QT_FORWARD_DECLARE_CLASS(QAbstractButton)
 
 namespace ads
 {
diff --git a/src/DockAreaWidget.h b/src/DockAreaWidget.h
index 50ccd01..16f42d7 100644
--- a/src/DockAreaWidget.h
+++ b/src/DockAreaWidget.h
@@ -35,8 +35,8 @@
 #include "ads_globals.h"
 #include "DockWidget.h"
 
-class QXmlStreamWriter;
-class QAbstractButton;
+QT_FORWARD_DECLARE_CLASS(QXmlStreamWriter)
+QT_FORWARD_DECLARE_CLASS(QAbstractButton)
 
 namespace ads
 {
diff --git a/src/DockContainerWidget.h b/src/DockContainerWidget.h
index c9a764f..8f1b04c 100644
--- a/src/DockContainerWidget.h
+++ b/src/DockContainerWidget.h
@@ -35,7 +35,7 @@
 #include "ads_globals.h"
 #include "DockWidget.h"
 
-class QXmlStreamWriter;
+QT_FORWARD_DECLARE_CLASS(QXmlStreamWriter)
 
 
 namespace ads
diff --git a/src/DockManager.h b/src/DockManager.h
index ec9bc74..e0983fb 100644
--- a/src/DockManager.h
+++ b/src/DockManager.h
@@ -36,8 +36,8 @@
 #include "FloatingDockContainer.h"
 
 
-class QSettings;
-class QMenu;
+QT_FORWARD_DECLARE_CLASS(QSettings)
+QT_FORWARD_DECLARE_CLASS(QMenu)
 
 namespace ads
 {
diff --git a/src/DockOverlay.h b/src/DockOverlay.h
index 3cb87aa..88905e0 100644
--- a/src/DockOverlay.h
+++ b/src/DockOverlay.h
@@ -26,10 +26,11 @@
 #include <QHash>
 #include <QRect>
 #include <QFrame>
-class QGridLayout;
 
 #include "ads_globals.h"
 
+QT_FORWARD_DECLARE_CLASS(QGridLayout)
+
 namespace ads
 {
 struct DockOverlayPrivate;
diff --git a/src/DockWidget.h b/src/DockWidget.h
index d66d769..15f58d3 100644
--- a/src/DockWidget.h
+++ b/src/DockWidget.h
@@ -34,8 +34,8 @@
 
 #include "ads_globals.h"
 
-class QToolBar;
-class QXmlStreamWriter;
+QT_FORWARD_DECLARE_CLASS(QToolBar)
+QT_FORWARD_DECLARE_CLASS(QXmlStreamWriter)
 
 namespace ads
 {
diff --git a/src/FloatingDockContainer.cpp b/src/FloatingDockContainer.cpp
index c5bab75..18e7bfa 100644
--- a/src/FloatingDockContainer.cpp
+++ b/src/FloatingDockContainer.cpp
@@ -68,6 +68,7 @@ struct FloatingDockContainerPrivate
 	CDockContainerWidget *DropContainer = nullptr;
 	CDockAreaWidget *SingleDockArea = nullptr;
 	QPoint DragStartPos;
+	bool Hiding = false;
 #ifdef Q_OS_LINUX
     QWidget* MouseEventHandler = nullptr;
     CFloatingWidgetTitleBar* TitleBar = nullptr;
@@ -455,6 +456,7 @@ void CFloatingDockContainer::hideEvent(QHideEvent *event)
         return;
     }
 
+    d->Hiding = true;
 	for (auto DockArea : d->DockContainer->openedDockAreas())
 	{
 		for (auto DockWidget : DockArea->openedDockWidgets())
@@ -462,6 +464,7 @@ void CFloatingDockContainer::hideEvent(QHideEvent *event)
 			DockWidget->toggleView(false);
 		}
 	}
+	d->Hiding = false;
 }
 
 //============================================================================
@@ -652,11 +655,22 @@ void CFloatingDockContainer::onDockAreasAddedOrRemoved()
 //============================================================================
 void CFloatingDockContainer::updateWindowTitle()
 {
+	// If this floating container will be hidden, then updating the window
+	// tile is not required anymore
+	if (d->Hiding)
+	{
+		return;
+	}
+
+
 	auto TopLevelDockArea = d->DockContainer->topLevelDockArea();
 	if (TopLevelDockArea)
 	{
 		CDockWidget* CurrentWidget = TopLevelDockArea->currentDockWidget();
-		d->reflectCurrentWidget(CurrentWidget);
+		if (CurrentWidget)
+		{
+			d->reflectCurrentWidget(CurrentWidget);
+		}
 	}
 	else
 	{
diff --git a/src/ads_globals.h b/src/ads_globals.h
index abcc332..e7dee67 100644
--- a/src/ads_globals.h
+++ b/src/ads_globals.h
@@ -37,7 +37,7 @@
 #include <QDebug>
 #include <QStyle>
 
-class QAbstractButton;
+QT_FORWARD_DECLARE_CLASS(QAbstractButton)
 
 #ifndef ADS_STATIC
 #ifdef ADS_SHARED_EXPORT
@@ -60,7 +60,7 @@ class QAbstractButton;
 // dumps to qDebug and std::cout after layout changes
 #define ADS_DEBUG_LEVEL 0
 
-class QSplitter;
+QT_FORWARD_DECLARE_CLASS(QSplitter)
 
 namespace ads
 {