docs: function(graph, cells)
  	{
  		cells = cells || graph.getSelectionCells();
  		var result = graph.getExportableCells(graph.model.getTopmostCells(cells));
  		mxClipboard.insertCount = 1;
  		mxClipboard.setCells(graph.cloneCells(result));
  
  		return result;
  	}