public PanelViewModel( GridViewModel owner )
 {
     _grid = owner;
 }
 public WindowViewModel()
 {
     IsActive = false;
     GridOwned = new GridViewModel( this );
 }
 public PanelViewModel( GridViewModel owner, int position, PanelViewModel parent )
     : this(owner)
 {
     _parent = parent;
     if( position > 0 ) _position = position;
 }