In a method of rendering a plurality of graph elements, first sample data is generated to render an instance of a first graph element type in a first cell of a canvas panel. An indicator is received that indicates a second graph element type to present in the first cell overlaid with the instance of the first graph element type. Second sample data is generated to render an instance of the second graph element type in the first cell overlaid with the instance of the first graph element type. An indicator is received that indicates selection of a fourth indicator of the instance of the second graph element type. An indicator is received that indicates dropping of the fourth indicator into a second cell. Third sample data is generated to render a second instance of the second graph element type in the second cell.