@Override
	public void actionPerformed(ActionEvent event) {
		Object source = event.getSource();
		if (source instanceof JButton) {
			JButton button = (JButton) source;
			if (button == buttonOpen) {
				openFile();
			} else if (button == buttonPlay) {
				if (!isPlaying) {
					playBack();
				} else {
					stopPlaying();
				}
			} else if (button == buttonPause) {
				if (!isPause) {
					pausePlaying();
				} else {
					resumePlaying();
				}
			}
		}
	}