If this Window is visible, sends this Window to the back and may cause
it to lose focus or activation if it is the focused or active Window.
Places this Window at the bottom of the stacking order and shows it
behind any other Windows in this VM. No action will take place is this
Window is not visible. Some platforms do not allow Windows which are
owned by other Windows to appear below their owners. Every attempt will
be made to move this Window as low as possible in the stacking order;
however, developers should not assume that this method will move this
Window below all other windows in every situation.
Because of variations in native windowing systems, no guarantees about
changes to the focused and active Windows can be made. Developers must
never assume that this Window is no longer the focused or active Window
until this Window receives a WINDOW_LOST_FOCUS or WINDOW_DEACTIVATED
event. On platforms where the top-most window is the focused window,
this method will probably cause this Window to lose focus. In
that case, the next highest, focusable Window in this VM will receive
focus. On platforms where the stacking order does not typically affect
the focused window, this method will probably leave the focused
and active Windows unchanged.