gistfile1.txt

    searchText = new Text(this, SWT.BORDER);
    searchText.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, false, 2, 1));
    searchText.addKeyListener(new KeyAdapter() {
      public void keyPressed(KeyEvent e) {
        if(e.keyCode == SWT.ARROW_DOWN) {
          searchResultViewer.getTree().setFocus();
          if(searchResultViewer.getTree().getItemCount()>0) {
            searchResultViewer.setSelection(new StructuredSelection(searchResultViewer.getTree().getItem(0)), true);
          }
        }
      }
    });