public void ZoomIn()
 {
     if (maxZoomOffset >= Constance.MaxZoomOffset)
     {
         ControlService.EnableZoom(MenuCommands.ZoomIn, false);
         ZoomInEnable = false;
         return;
     }
     ControlService.EnableZoom(MenuCommands.ZoomIn, true);
     ControlService.EnableZoom(MenuCommands.ZoomOut, true);
     ZoomInEnable  = true;
     ZoomOutEnable = true;
     maxZoomOffset++;
     _Zoom++;
     ZoomInAndOut(_Zoom);
 }
        public void ZoomOut()
        {
            if (_Zoom <= 1)
            {
                ControlService.EnableZoom(MenuCommands.ZoomOut, false);
                ZoomOutEnable = false;
                _Zoom         = 1;
                return;
            }
            ControlService.EnableZoom(MenuCommands.ZoomIn, true);
            ControlService.EnableZoom(MenuCommands.ZoomOut, true);
            ZoomInEnable  = true;
            ZoomOutEnable = true;

            maxZoomOffset--;
            _Zoom--;
            //_Zoom = _Zoom <= 1 ? 1 : _Zoom;
            ZoomInAndOut(_Zoom);
        }