If the NDockingToolbar is set to
- CanFloat: true
- AllowHide: true

The user can grab the toolbar and let it float somewhere. In this case the toolbar gets a "x" in the top right corner where the user can hide (but not close; dispose; etc.) the toolbar.

After that i can see that the Visible property is changed to "false", but the event VisibleChanged won't be raised. What's the way to know the user clicked the "x" in the top right corner?