<ITEM> <<lower(1:W)>> : If the <<W>> argument is omitted then the command lowers the widget so that it is below all of its siblings in
the stacking order (it will be obscured by any siblings and will not obscure any siblings that overlap it). If
<<W>> is specified then it must be an handle to another widget that is either a sibling of this widget or the
descendant of a sibling of this widget. In this case the <<lower>> command will insert this widget into the stacking order
just below <<W>>; this could end up either raising
or lowering window. 
