* Smoke test that merely creates the panel.
*/
@Test
public void buttonPanelSmokeTest() {
JFrame jf = new JFrame();
ButtonPanel bp = new ButtonPanel().withParent(jf);
jf.add(bp);
jf.setVisible(true);
// next create suitable mocks for the listeners.
// and then all we need is a gui testing
// framework allowing us to click...