Hi J Kabath,
Thank you for taking the time to evaluate our products.
Is this a Silverlight ChildWindow object? This is a known issue and unfortunately there is no workaround in the currently released product. I've attached a document that more clearly outlines what we do and don't support for popup windows in the Silverlight realm.
The good news is that support for ChildWindow's is currently in development and will be released in a near future version. I can't say exactly when but it will be before the end of the year. One thing to keep in mind, every purchase automatically comes with 1 year of premier support which includes free upgrades to any new versions released with that time.
the Telerik team
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