Treeview tooltips disappear/flashing - something to do with MainForm transparencykey

[pigeonrandle]

Hi,
I have a treeview which has some nodes whose text are too long to
display, so, when i hover my mouse over the node a tooltip appears
showing all the text, and then disappears almost immediately. If i move
my mouse across the node it flashes on and off (something seems to be
cancelling it?)

If i turn my main form's transparencykey to nothing, the problem goes
away.

Anyone got any suggestions?!
Cheers,
James.

 

[pigeonrandle]

Any comments?!