float x = container.getWidth() - 5 * BUTTON_WIDTH;
float y = container.getHeight() - 2 * BUTTON_HEIGHT;
this._decIntentDistanceButton =
new TextButton(x, y, STR_DEC_DISTANCE, buttonSound);
listener.add(this._decIntentDistanceButton);
this._decIntentDistanceButton.addListener(new SimpleClickListener() {