Hello Amitava Mitra,
I would suggest that you review the following help article:
Sharing the Embedded Popup Controls
If following the recommended steps, does not provide the required results, you can open a formal support ticket and send us a small sample project demonstrating the erroneous behavior. Also please confirm the exact version of
RadControls for ASP .NET AJAX that you are using and include any additional resources that might be related to the issue (CSS stylesheets, Javascript files etc.).
Regards,
Martin
the Telerik team
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