I want to be able to get the rectangle of the nested "grid" that appears as the child band. Do I have to sum together all the RowUIElements' and BandHeaderUIElement's rectangles? Is there an element that encompasses the entire nested grid?
There isn't a single UIElement that will contain all of the child rows of a particular parent row, so you would have to sum together the BandHeadersUIElement and the individual RowUIElements. You might find the UIElementViewer to be handy for this kind of work.
-Matt