WPF Popup hiding problem

Question

Suppose you have a ToggleButton for opening a Popup, same behaviour as all known elements as ComboBox etc.

... which is this c

Answer 1

I found the solution on this post : https://stackoverflow.com/a/5821819/651161

Using the following class will permit to handle the click before the togglebutton is pressed. The popup is closed because of the click but the click is then handled, so it doesn't trigger the ToggleButton click.

public class MyPopup : Popup {
    protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e) {
        bool isOpen = this.IsOpen;
        base.OnPreviewMouseLeftButtonDown(e);

        if (isOpen && !this.IsOpen)
            e.Handled = true;
    }
}