I agree that the tooltip position is not good. Unfortunately it cannot be changed without custom RadDateTimePicker control template, which we want to avoid at any cost. We will consider adding a property that will control the position of the hint tooltip after Q1 2011.
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!