Hello Tapas,
Is your page framed in another page? We are aware of a browser bug that causes modal popups to not display or misbehave inside an iframe because of a JavaScript error. The case and several workarounds are available in the following KB article:
http://www.telerik.com/support/kb/aspnet-ajax/window/modal-radwindow-in-radwindow-in-ie9-and-ie10.aspx.
If this is not your case I would advise that you try the following:
- make sure that there aren't any prior JavaScript errors on the page
- try the latest version of the controls (2013.1.403 at present)
- try disabling browser plugins to see if one of them is interfering with the page
Kind regards,
Marin Bratanov
the Telerik team
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