+// private CommonViewer createColumn(CommonViewer aViewer) {
+// TreeColumn column =new TreeColumn(aViewer.getTree(),SWT.NONE);
+// TreeColumn b = column;
+// b.setWidth(200);
+// b.setText("Column 1");
+//
+// final TreeViewerColumn column2 = new TreeViewerColumn(aViewer,SWT.NONE);
+// column2.getColumn().setWidth(200);
+// column2.getColumn().setText("Column 2");
+//
+// column2.setLabelProvider(new CoverageLabelProvider(column2,aViewer));
+//
+// aViewer.getTree().setHeaderVisible(true);
+// OwnerDrawLabelProvider.setUpOwnerDraw(getCommonViewer());
+// return aViewer;
+// }
+ /*copy from coverage history SampleView*/
+ private TreeViewer createColumn(TreeViewer aViewer, TreeColumnLayout ad) {
+