diff --git a/source/Components/AvalonDock/Controls/LayoutAnchorableFloatingWindowControl.cs b/source/Components/AvalonDock/Controls/LayoutAnchorableFloatingWindowControl.cs
index bf776e49..fb4d5ea6 100644
--- a/source/Components/AvalonDock/Controls/LayoutAnchorableFloatingWindowControl.cs
+++ b/source/Components/AvalonDock/Controls/LayoutAnchorableFloatingWindowControl.cs
@@ -226,14 +226,17 @@ protected override IntPtr FilterMessage(IntPtr hwnd, int msg, IntPtr wParam, Int
 			switch (msg)
 			{
 				case Win32Helper.WM_ACTIVATE:
-					var isInactive = ((int)wParam & 0xFFFF) == Win32Helper.WA_INACTIVE;
-					if (_model.IsSinglePane)
-					{
-						LayoutFloatingWindowControlHelper.ActiveTheContentOfSinglePane(this, !isInactive);
-					}
-					else
-					{
-						LayoutFloatingWindowControlHelper.ActiveTheContentOfMultiPane(this, !isInactive);
+					var isActive = ((int)wParam & 0xFFFF) != Win32Helper.WA_INACTIVE;
+					if (isActive)
+					{ 
+						if (_model.IsSinglePane)
+						{
+							LayoutFloatingWindowControlHelper.ActiveTheContentOfSinglePane(this);
+						}
+						else
+						{
+							LayoutFloatingWindowControlHelper.ActiveTheContentOfMultiPane(this);
+						}
 					}
 
 					handled = true;
diff --git a/source/Components/AvalonDock/Controls/LayoutDocumentFloatingWindowControl.cs b/source/Components/AvalonDock/Controls/LayoutDocumentFloatingWindowControl.cs
index 9072da87..ba175e6f 100644
--- a/source/Components/AvalonDock/Controls/LayoutDocumentFloatingWindowControl.cs
+++ b/source/Components/AvalonDock/Controls/LayoutDocumentFloatingWindowControl.cs
@@ -107,14 +107,17 @@ protected override IntPtr FilterMessage(IntPtr hwnd, int msg, IntPtr wParam, Int
 			switch (msg)
 			{
 				case Win32Helper.WM_ACTIVATE:
-					var isInactive = ((int)wParam & 0xFFFF) == Win32Helper.WA_INACTIVE;
-					if (_model.IsSinglePane)
+					var isActive = ((int)wParam & 0xFFFF) != Win32Helper.WA_INACTIVE;
+					if (isActive)
 					{
-						LayoutFloatingWindowControlHelper.ActiveTheContentOfSinglePane(this, !isInactive);
-					}
-					else
-					{
-						LayoutFloatingWindowControlHelper.ActiveTheContentOfMultiPane(this, !isInactive);
+						if (_model.IsSinglePane)
+						{
+							LayoutFloatingWindowControlHelper.ActiveTheContentOfSinglePane(this, true);
+						}
+						else
+						{
+							LayoutFloatingWindowControlHelper.ActiveTheContentOfMultiPane(this, true);
+						}
 					}
 
 					handled = true;
@@ -419,4 +422,4 @@ private void OnExecuteCloseWindowCommand(object parameter)
 			}
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/source/TestApp/MainWindow.xaml b/source/TestApp/MainWindow.xaml
index 9fc89202..4dfcca60 100644
--- a/source/TestApp/MainWindow.xaml
+++ b/source/TestApp/MainWindow.xaml
@@ -115,6 +115,13 @@
                                     Foreground="White"
                                     Text="{Binding TestTimer, Mode=OneWay, StringFormat='Document 2 Attached to Timer ->\{0\}'}" />
                             </LayoutDocument>
+							<LayoutDocument Title="Document 3" ContentId="document3">
+								<Button
+									Margin="25"
+									VerticalAlignment="Top"
+									Click="ShowMessageBox_click"
+									Content="Click to open message box" />
+							</LayoutDocument>
                         </LayoutDocumentPane>
                     </LayoutDocumentPaneGroup>
                     <LayoutAnchorablePaneGroup DockWidth="50">
diff --git a/source/TestApp/MainWindow.xaml.cs b/source/TestApp/MainWindow.xaml.cs
index 5d80ab83..71ad291b 100644
--- a/source/TestApp/MainWindow.xaml.cs
+++ b/source/TestApp/MainWindow.xaml.cs
@@ -256,5 +256,7 @@ private void OnNewFloatingWindow(object sender, RoutedEventArgs e)
             anchorable.AddToLayout(dockManager,AnchorableShowStrategy.Most);
             anchorable.Float();
         }
+
+		private void ShowMessageBox_click(object sender, RoutedEventArgs e) => MessageBox.Show("Test messge", "Test");
     }
 }