Thank you for writing.
I am afraid that there is no way for RadWindow to know when the user has tapped a text box because this action does not trigger any manipulation events, the text box somehow swallows all manipulation notifications. What you can do is use RadModalWindow and set its Background property to #00000000. This way you will prevent interaction with the text box because the background layer will handle the manipulation before the text box.
You will be able to do this in the Q3 2011 release however. It will be available next week. Currently RadModalWindow disregards the CanCloseOnOutsideTap property.
Please write again if you have other questions.
the Telerik team
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