public bool OnKeyUpCore(MapKeyEventArgs e)
 {
     if (_fullControllManipulator != null)
     {
         return(_fullControllManipulator.OnKeyUpCore(e));
     }
     else
     {
         bool redraw = false;
         foreach (ManipulatorBase m in _manipulators)
         {
             redraw |= m.OnKeyUpCore(e);
         }
         return(redraw);
     }
 }