protected override ElementBaseShape CreateElement()
		{
			var element = new ElementPolygonXDirection();
			var propertiesViewModel = new DirectionPropertiesViewModel(element, _directionsViewModel);
			if (!DialogService.ShowModalWindow(propertiesViewModel))
				return null;
			Helper.SetXDirection(element);
			return element;
		}
		public override ElementBase Clone()
		{
			var elementBase = new ElementPolygonXDirection();
			Copy(elementBase);
			return elementBase;
		}