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Alex Rivera
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Imagine the situation you open a WPF Popup (e.g. through ButtonClick ). You have a ListBox directly in the Popup with some items, so you have to be able to scroll. Imagine that this is your Custom Control and it's located in the ScrollViewer . Now if you move with your mouse outside from the Popup surface and scroll, what happens? You scroll up and down but with the Popup opened ! And that's the problem. The question is, how to detect from inside the Control, that some other unknown Parent Control in the VisualTree has started to scroll ? and consecutively set IsDropDownOpen = false ?
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