I have a custom UserControl that contains a grid and toolbar. When I add this control to a custom drag canvas, it does not respond to MouseClick events.
I suspected the custom drag panel as it overrides UIElement.OnPreviewMouseLeftButtonDown and sets e.Handled = true but commenting out line that sets e.Handled to true does not allow control process mouse clicks.
If, however, I derive my custom control from Popup, it sees mouse clicks as toolbar button commands are executed.
What am I observing?
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