How can I preserve the layout state of a closed toolwindow?

I have an application that extensively uses the docking library to display tool windows. Although I can generally serialize the tool window's positions correctly, the one lingering problem I have is with closed tool windows.

For example, imagine dragging a docked tool window outside of the application window, so it becomes a floating tool window. When I close my application and re-run it, the tool window appears as a floating tool window exactly where it was before.

However, if I do the same thing but then close the tool window, and then close the application, I don't get this behavior. Instead, the next time I activate the tool window, the tool window is back to being docked in its default position. Is there a way for the activated tool window to return to its previous opened position across application runs?

Note that I am using user settings to persist the layout across application runs. Additionally, I thought the LazyLoad behavior might be helpful here, but it didn't seem to be. I'm sending a code sample along that demonstrates the problem; it's based on the persistence sample in the Actipro samples browser.

Thanks,

-Craig

[Modified at 11/27/2010 09:50 PM]