public ImageIcon getFoldingIcon(mxCellState state)
	{
		if (state != null && isFoldingEnabled()
				&& !getGraph().getModel().isEdge(state.getCell()))
		{
			Object cell = state.getCell();
			boolean tmp = graph.isCellCollapsed(cell);

			if (graph.isCellFoldable(cell, !tmp))
			{
				return (tmp) ? collapsedIcon : expandedIcon;
			}
		}

		return null;
	}