Thank you for writing and thank you for choosing RadControls for WinForms.
In order to understand whether the passed form is a RadForm descendant or not, check whether the type of the frm variable is RadForm:
Private Sub SetupScreen(ByVal frm As Form)
If TypeOf frm Is RadForm Then
'Your existing logic
I hope this helps. Write back if you have additional questions.
the Telerik team
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