A: 

You must call Control.Update() after Control.Invalidate() to get the desired effect. Or make your life slightly easier by simply calling .Refresh().

colithium  2009-03-14 09:21:08
I tried it, but the behavior remains unchanged.
 2009-03-16 15:53:11
Hmm... That's strange since it goes away when drug off screen. Every time I've seen that behavior it's been the case that an Invalidation/Update pass fixes it (that's basically what happens when you drag it off screen too). I'll post back if I figure it out.
colithium  2009-03-17 01:43:18

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