Thank you for writing.
Please consider the following code snippet:
Int32 HTCAPTION = 0x2;
Int32 WM_NCLBUTTONDBLCLK = 0xA3;
(msg.WParam.ToInt32() == HTCAPTION)
You have to add these constants and the method to your form.
I hope this will help. If you have further questions, feel free to ask.
the Telerik team
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