WPF application on Citrix

I'm trying to use a WPF application on our Citrix server, and made a really simple window with a button and a textbox. When running the application, noting but the application name on top of 开发者_开发技巧the window is shown. Is it not possible to use WPF on Citrix, or is our Citrix server too old?

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It should be possible to use WPF on Citrix starting with PS 4.5 Feature pack 1.

Is your version older than this?