Hi Janna,
In case that you create RadWindow (with Controls Container) dynamically, you should recreate its content on each PostBack. I created for you a simple example, which illustrates how to create RadWindow dynamically and recreate the UserControls in it, on each PostBack.
ASPX:
CodeBehind:
In case that this is not you looking for, please open a new support thread, and send us a running project where we can observe the problem you experience, and we will do our best to help you.
All the best,
Petio Petkov
the Telerik team
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