Hello Jamie,
There is no such API in our control as such functionality is out of RadWindow's scope. What I suggested is to use some JavaScript code to intercept certain keyboard combinations and cancel them while the RadWindow is active. Here are some resources that might help you in this task:
http://www.openjs.com/scripts/events/keyboard_shortcuts/
http://www.scottklarr.com/topic/126/how-to-create-ctrl-key-shortcuts-in-javascript/
All the best,
Georgi Tunev
the Telerik team
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