public void QuarterRectangle_MouseEnter(Quarter quarterSender)
 {
     _actionHandler.ConditionallyAddToSelection(quarterSender);
     quarterSender.SetSelectionFrame();
 }
 public void QuarterRectangle_MouseLeftButtonDown(Quarter quarterSender)
 {
     quarterSender.SetSelectionFrame();
     _actionHandler.ConditionallyAddToSelection(quarterSender);
     _actionHandler.SetSIPstate();
 }