I was playing around with a Windows Store app this weekend and ran into a pretty annoying problem. At first, I couldn't tell what was going on; it seemed the app would crash at random times for no apparent reason. But after a bit of debugging to isolate the problem, I figured out what was going on. Problem: If you have a ToolTipService.ToolTip data binding in a Windows Store app and the value of that binding transitions from non-null to null while it's being displayed, the next time the tooltip is shown, the platform will throw a NullReferenceException from native code and terminate the application.


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