ly the first child of the root (ie. layer 0).
				var parent = graph.getDefaultParent();
								
				// Adds cells to the model in a single step
				graph.getModel().beginUpdate();
				try
				{
					var v1 = graph.insertVertex(parent, null, 'Doubleclick', 400, 200, 80, 30);
					var v2 = graph.insertVertex(parent, null, 'Right-/Shiftclick', 600, 450, 120, 30);
					var v3 = graph.insertVertex(parent, null, 'Connect/Reconnect', 600, 200, 120, 30);
					var v4 = graph.insertVertex(parent, null, 'Control-Dra