Hi Kamini,
Could you try calling the editor's onParentNodeChanged() method as adivsed here:
http://www.telerik.com/help/aspnet-ajax/window-troubleshooting-radeditor-in-radwindow.html.
You can also consider using a RadWindow instead of the other dialog you are using right now.
Regards,
Marin Bratanov
Telerik
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