I have a winform with 2 radpageviews and controls on each. I have set the ones I don't care about to 0 and those I care about to tabindexes of 5 each (i.e. 5, 10 etc.)
They seem to go all over and not in the order I have it. See attachment. Left side is a pageview and the one in the middle is as well. Each of the tabs on the left use the same user control (date, processes, first shift etc).