Can you also confirm the version of the suite that you are using? I am asking this because there have recently been fixes for iPad and I advise that you try the latest one and see if things work as expected with you.
Also, in case you are loading an entire page in the RadWindow could you try loading it in a simple iframe to confirm if the problem stems from RadWindow or from some of the numerous issues iOS has with iframes?
If you can reproduce the problem with our online demos could you tell me which one and what are the steps I need to take in order to see the issue?
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed