>>I have a grid column containing a radio button. I want a tooltip to appear whenever the mouse is over the column containing the radio button. Currently, the tooltip only occus when a cell has the focus and the mouse is over it.
>One possible solution is to have the shape that covers the grid and track down the mouse movement to display appropriate TooltipText. Ahh, great pain...

Gee, this response is not encouraging. Is this really the only way? If someone has some insight, please share!