Let me point out that currently a modal RadWindow (which is what the RadConfirm is) changes the tabIndex property of all input elements and other elements for which it is relevant to -1 when it is shown. This means that you cannot tab to the page as you can see in the video I recorded: http://screencast.com/t/tL9jUpuhdlut
. I used the previously attached page as basis and simply added a textbox that alerts when it gets focus.
It is also important to note that if you expect the keyboard to be used as a navigation tool you would need to prepare your page accordingly - i.e. set tabIndex and accessKey properties where needed. TabIndex is needed for all elements that trigger action when clicked - such as buttons, anchors, inputs, etc, accessKey usage is a developer decision. If a page is not properly configured for keyboard support some unexpected behavior may arise for which we cannot take care of as this is an invalid scenario.
All the best,
the Telerik team
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