WPF ComboBox: click outside of popup suppress mouse click

Question

I use a standard WPF ComboBox control. When popup is opened and user clicks somewhere outside, popup is closed. But if there is button on the window and user clicks on it (with

Answer 1

I used an easy solution: In the PreviewMouseLeftButtonDown event, if the mouse pos is outside the combobox, close the dropdown. This will allow other control to get the mouse click:

Dim p = Mouse.GetPosition(combo)
If p.X < 0 OrElse p.Y < 0 OrElse p.X > combo.Width OrElse p.Y > combo.Height Then
     cmb.IsDropDownOpen = False
End If