>>>How can I tell when the mouse leaves an object? I'm using MouseMove to display something when mouse is above the object, but I want to hide it (make invisible) when mouse is no longer over the object. It's a grid column, so there aren't a lot of events to work with...
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>>I guess, it would be enough to display something for limited time (e.g. 2 sec) and then release it automatically using timer.
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>making your own tool tips???

Yes, I remember Bruce had problems with 'grid cell' Tool tips, and now he is trying to work around.