It looks like you have done most of the steps required to use the RadWindow control as main window except removing the StartupUri
from the App.xaml and possibly making the MainWindow to inherit RadWindow.
I created and attached a sample project for you showing how to use RadWindow as main window, hope this is helpful. As a side note it is good to set the ShowInTaskbar
attached property in order to be able to see the window in the taskbar.
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