I just thought I'd mention some subtle curious and irritating behaviour I
found yesterday.

 

You've probably all seen Silverlight code that detects mouse enter over a
certain control and animates another control into view. I eventually got one
of these working too, but here's the trap: If the popup control has a
ComboBox as a child control, opening the combo drop will trigger a mouse
leave from the parent popup and it will decide to close. It seems that the
ComboBox is an aggregate control and something inside it takes the mouse
enter event when you open it.

 

I couldn't find a workaround, so I gave up and replaced the ComboBox with a
ListBox and the problem doesn't happen.

 

Greg

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