protected Command getMoveCommand(ChangeBoundsRequest request) {

		Point moveDelta = request.getMoveDelta(); 

		Rectangle myRect = getHostFigure().getClientArea();
		myRect.translate(moveDelta);
		
		Rectangle parentRectangle = ((GraphicalEditPart)this.getHost().getParent()).getFigure().getClientArea();
		
		//cannot move outside parent left and  up side
		if (myRect.x<0 || myRect.y<0)
			return null;
		
		//cannot move outside parent bottom side
		if (myRect.y+myRect.height>parentRectangle.height)
			return null;
		
		//cannot move outside parent right side		
		if (myRect.x+myRect.width>parentRectangle.width)
			return null;
		
		return super.getMoveCommand(request);

	}