Hello Rich,
I answered your ticket last week and I just noticed this thread. For convenience I am pasting my reply below:
In such case, I suggest to ajaxify the control - this way you will still be able to show the RadWindow from the server and yet, to prevent it from reappearing when the Back button is pressed. See this forum thread for more details and a sample code:
http://www.telerik.com/community/forums/aspnet-ajax/window/display-radalert-amp-browser-back-button.aspx
Kind regards,
Georgi Tunev
the Telerik team
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