Desktop apps on top of Metro - Extended

Hi Rob,

    I follow you at http://social.msdn.microsoft.com/Forums/en-US/toolsforwinapps/thread/8529357f-3ff8-4c83-baaf-5215ca9cc14a and success to write a desktop app(WPF) on top of metro. But I met a problem: if I set "this.ShowInTaskbar = false", my desktop window can not show on top of metro. Why and How to solve this issue? Please help!!