FindCrossing
crossRef = hTab->FindCrossing(oldVTab->Position());
leftTopRef = left->FindCrossing(top);
rightTopRef = right->FindCrossing(top);
leftBottomRef = left->FindCrossing(bottom);
rightBottomRef = right->FindCrossing(bottom);
Crossing* FindCrossing(Tab* tab);
Crossing* FindCrossing(float tabPosition);
Crossing* crossing = tab->FindCrossing(orthTab);