Occurs when the window's location changes.
public event EventHandler LocationChanged
<object LocationChanged="EventHandler" .../>
A window's location changes when:
A user moves a window by dragging it with the window's title bar.
A window is moved after DragMove is called.
Either the Left or Top property is set programmatically.
The Move menu item of a window's System menu is chosen.
The WindowState property is changed.