I already answered your support thread and for your convenience and for others who might have the same questions I pasted my reply below:
Straight to your questions:
- In order to get the modal background of the RadWindow to cover the whole page, you should open the RadWindow from the main page and there is no other solution to this. That is why I suggest to move the RadWindow there and reference the main page from the frame and open the RadWindow from there.
- As to your second question, I am afraid I could not completely understand what is the problem you experience - is it about implementing radconfirm instead of confirm or the problem is in canceling an event (if so, what is the exact event)? Please, provide more details about the exact scenario.
All the best,
the Telerik team