WPF Window on Winlogon Desktop

I'm trying to show a custom Window or Control designed and built in WPF on Winlogon Desktop. I already managed, to switch the Desktop of the Thread with "SetThreadDesktop" and the Window opens on the Winlogon desktop.

The Proble开发者_StackOverflowm is, that the content of the Window is not rendered on the Winlogon Desktop. If I open the same Window on the Default Desktop, everything works as expected.

If I replace the WPF Window with a Winforms Form, the GUI is responsive, but I want to use some of the animation features of WPF.