Menu menu1 = new Menu(treeViewer.getTree());
MenuItem item = new MenuItem(menu1, SWT.PUSH);
item.setText("Test 1");
item.addSelectionListener(new Test1Listener());
MenuItem item = new MenuItem(menu1, SWT.PUSH);
item1.setText("Test2");
item1.addSelectionListener(new Test2Listener());
tableViewer.getTable().setMenu(menu1);