private void createSelectedListBox(Composite parent) {
    selectedListBox = new List(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER);
    selectedListBox.addSelectionListener(
        new SelectionListener() {
          public void widgetDefaultSelected(SelectionEvent event) {}

          public void widgetSelected(SelectionEvent event) {

            if (selectedListBox.getSelectionCount() > 0) setRemoveButtonEnabled(true);
            else setRemoveButtonEnabled(false);
            return;
          }
        });

    GridData gd = new GridData(GridData.FILL_BOTH);
    gd.widthHint = SIZING_LISTS_WIDTH;
    gd.heightHint = SIZING_LISTS_HEIGHT;
    selectedListBox.setLayoutData(gd);
  }