The RadWindow control is displaying in a WPF window with its AllowTransparency
property set to true which disabled the rendering of any non-wpf content inside the control. To disable this property and be able to view the WinForms controls inside the RadWindow you will need to set the AllowTransparency attached property of the RadWindow. The next code snippet shows how to set that property from the code behind:
MyRadWindow window =
This MyRadWindow control is an RadWindow with a WindowsFormsHost in which a Winforms control is placed. Hope this is helpful.
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