abstraction.showPresentation();
showPresentation();
	public void actionPerformed(ActionEvent e) 	{		String s = (String) e.getActionCommand();		try {		   int index = Integer.parseInt(s);		   switch (index) { 				case V_VISIBLE:					abstraction.showPresentation();					break;				case CONTROL:					showControls();					break; 					case SAVE_AS:					showImageSaver();					break;		   }		} catch(NumberFormatException nfe) {   			   throw nfe;  //just to be on the safe side...		} 	}