Ok, this is making me feel like a big dummy, because after searching apparently nobody else has ever had this problem. When I try to use HideEvent="ManualClose" with my tooltips, the [x] for closing the tooltip appears on top of the tooltip text, hiding some of the text. What simple thing am I missing here? If it matters, I am using the Office2007 skin and not specifying a fixed height, since the length of text can vary.