Как показать Integer в TreeView?

		TreeIter row;
		CellRendererText xRenderer, yRenderer;
		TreeViewColumn xColumn, yColumn;

		int[][] points = figure.getPoints();

		final DataColumnString xCol, yCol;
		model_points = new ListStore(new DataColumn[] {
				xCol = new DataColumnString(), yCol = new DataColumnString() });

		lview_points = new TreeView(model_points);
		lview_points.setCanFocus(false);
		lview_points.setCanDefault(false);
		lview_points.setSizeRequest(80, 0);

		for (int[] point : points) {
			row = model_points.appendRow();
			model_points.setValue(row, xCol, String.valueOf(point[0]));
			model_points.setValue(row, yCol, String.valueOf(point[1]));
		}

		xColumn = lview_points.appendColumn();
		xColumn.setTitle("X");
		xRenderer = new CellRendererText(xColumn);
		xRenderer.setText(xCol);
		xRenderer.setEditable(true);

		yColumn = lview_points.appendColumn();
		yColumn.setTitle("Y");
		yRenderer = new CellRendererText(yColumn);
		yRenderer.setText(yCol);
		yRenderer.setEditable(true);