public Object[] importCells(Object[] cells, double dx, double dy,
				Object target, Point location)
		{
			if (target == null && cells.length == 1 && location != null)
			{
				target = getCellAt(location.x, location.y);

				if (target instanceof mxICell && cells[0] instanceof mxICell)
				{
					mxICell targetCell = (mxICell) target;
					mxICell dropCell = (mxICell) cells[0];

					if (targetCell.isVertex() == dropCell.isVertex()
							|| targetCell.isEdge() == dropCell.isEdge())
					{
						mxIGraphModel model = graph.getModel();
						model.setStyle(target, model.getStyle(cells[0]));
						graph.setSelectionCell(target);

						return null;
					}
				}
			}

			return super.importCells(cells, dx, dy, target, location);
		}