Hi Shrikant,
Could you please open a ticket and send a sample application where this problem occurs?
I am asking you this because the code that you show is from RadWindowManager's popup templates - radalert, radprompt and radconfirm. The original code however is properly closed and rendered correctly on the page. For example, below is the radalert's template (I see that in your last post you pasted part of it) but as you can see the tags are closed - the code below is from the HTML dump of a page with a RadWindowManager in it.
The problem that you report leads me to believe that the problem might not be directly related to the RadWIndowManager, but to an error that occurs on your side that prevents the proper rendering of the control. Without being able to reproduce it however, I cannot say what the reason might be.
All the best,
Georgi Tunev
the Telerik team
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