| clickedBg | The background for the clicked state. |
| listeners | The listeners |
| normalBg | The background for the normal state. |
| addListener(l) | Add a listener. |
| doClick() | Perform a button click, i.e. notify the listeners. |
| draw() | Draw the button. |
| focusable() | A Button is focusable. |
| handled(event) | Handle keystrokes and clicking via the pointer. |
| removeListener(l) | Remove a listener. |