codice:
archi= new myRadioButton(textBlock.getString("archi"));
		vertici= new myRadioButton(textBlock.getString("vertici"));
		sceltainiziale= new ButtonGroup();
		sceltainiziale.add(archi);
		sceltainiziale.add(vertici);
		archi.setSelected(true);

		this.add(archi,BorderLayout.NORTH);
		this.add(vertici,BorderLayout.NORTH);
    	
    	scrolledge= new JScrollPane(ep);
    	scrolledge.setPreferredSize(new Dimension(380,360));
    	scrolledge.setVisible(false);
    	
    	scrollvertici= new JScrollPane(vp);
    	scrollvertici.setPreferredSize(new Dimension(380,360));
    	scrollvertici.setVisible(false);
    	
    	
    	add(scrolledge);
    	add(scrollvertici);
		
		
		

		if(archi.isSelected()){
			
			scrolledge.setVisible(true);
			scrollvertici.setVisible(false);
		
		}else{
			
			scrolledge.setVisible(false);
			scrollvertici.setVisible(true);
			
		}
			
		

		archi.addActionListener(this);
		vertici.addActionListener(this);
		
		
    }
	
	public void actionPerformed(ActionEvent e) {

		if(archi.isSelected()){
		
			scrolledge.setVisible(true);
			scrollvertici.setVisible(false);
			

		}

		if(vertici.isSelected()){
			
			scrolledge.setVisible(false);
			scrollvertici.setVisible(true);
			
			

		}

	}