Problem with "blinking" ToolWindows after DockSiteLayoutSerializer.LoadFromString

Hi,

I have an application where I have created some ToolWindows which the user may open/close with a checkbox-control in the Ribbon. These ToolWindows are always floating, are connected to my DockSite and saved/loaded using the DockSiteLayoutSerializer.

Code fragment showing creation of the serializer and one of the tool-windows:

	// Create the layout serializer
 	_layoutSerializer = new DockSiteLayoutSerializer();
	_layoutSerializer.SerializationBehavior = DockSiteSerializationBehavior.All;
	_layoutSerializer.DocumentWindowDeserializationBehavior = DockingWindowDeserializationBehavior.AutoCreate;

	// Create the MediaPlayer tool-window
 	MediaPlayerWindow = new ToolWindow(MyDockSite, "MediaPlayerWindow", "Media Player", null, new MyMediaPlayer());
	MediaPlayerWindow.CanRaft = true;
	MediaPlayerWindow.CanDockBottom = false;
	MediaPlayerWindow.CanDockLeft = false;
	MediaPlayerWindow.CanDockRight = false;
	MediaPlayerWindow.CanDockTop = false;
	MediaPlayerWindow.CanBecomeDocument = false;
  

Show/hide the tool-window:

	public void ShowMediaPlayerWindow(bool show)
	{
		if (show)
		{
			MediaPlayerWindow.Float();
			MediaPlayerWindow.Activate(true);
		}
		else
			MediaPlayerWindow.Close();
	}

 When the application is closed, I'm calling _layoutSerializer.SaveToString(MyDockSite), and when the application starts up, _layoutSerializer.LoadFromString(xml, MyDockSite).

If I run the application, open and close the tool-window and close the application, the saved xml looks like this:

	<RaftingHosts>
		<RaftingHost IsMaximized="false" Location="207,207" Size="194,197" State="Floating">
			<Content xsi:type="ToolWindowContainer" AutoHideSize="200,200" DockedSize="200,200" DocumentSize="200,200" FloatingSize="194,197" Size="194,197">
				<UIElement xsi:type="Track" UniqueId="854be9f7-0cc5-43bf-a948-a62a643326fe" />
			</Content>
		</RaftingHost>
	</RaftingHosts>
	<ToolWindows>
		<ToolWindow UniqueId="854be9f7-0cc5-43bf-a948-a62a643326fe" AutoHideSize="200,200" DockedSize="200,200" DocumentSize="200,200" FloatingSize="194,197" Size="200,200" IsOpen="false" LastState="Docked" Name="MediaPlayerWindow" RaftingLocation="207,207" State="Floating" />
	</ToolWindows>

When starting the application, the tool-window briefly "blinks".

If I then open and close the tool-window again, the saved xml looks like this:

	<RaftingHosts>
		<RaftingHost IsMaximized="false" Location="207,207" Size="192,196" State="Floating">
			<Content xsi:type="ToolWindowContainer" AutoHideSize="200,200" DockedSize="200,200" DocumentSize="200,200" FloatingSize="192,196" Size="192,196">
				<UIElement xsi:type="Track" UniqueId="854be9f7-0cc5-43bf-a948-a62a643326fe" />
			</Content>
		</RaftingHost>
		<RaftingHost IsMaximized="false" Location="207,207" Size="192,196" State="Floating">
			<Content xsi:type="ToolWindowContainer" AutoHideSize="200,200" DockedSize="200,200" DocumentSize="200,200" FloatingSize="192,196" Size="192,196" />
		</RaftingHost>
	</RaftingHosts>
	<ToolWindows>
		<ToolWindow UniqueId="854be9f7-0cc5-43bf-a948-a62a643326fe" AutoHideSize="200,200" DockedSize="200,200" DocumentSize="200,200" FloatingSize="192,196" Size="200,200" IsOpen="false" LastState="Docked" Name="MediaPlayerWindow" RaftingLocation="207,207" State="Floating" />
	</ToolWindows>

When starting the application, the tool-window now "blinks" twice. It seems the "RaftingHosts" section grows for each time I open and close the tool-window, and more annoyingly, the tool-window "blinks" the same amount of times as there are "RaftingHosts" sections.

I assume I'm doing something wrong in my serialization/deserialization, but how can I avoid the "blinking" tool-windows at startup (and the growing  "RaftingHosts" section)?

Thanks,

Geir