codice:
    public FtpImmagini() {
        container=this.getContentPane();
        Layout=new GridBagLayout();
        container.setLayout(Layout);
        constraints=new GridBagConstraints();
        constraints.weightx=100;
        constraints.weighty=100;
        JLabel lblImmagine=new JLabel("Immagini");
//        constraints.fill=GridBagConstraints.NORTH; // NON HA SENSO!!!
        constraints.fill = GridBagConstraints.HORIZONTAL;
        //oppure: constraints.anchor = GridBagConstraints.NORTH;
        addcomponent(lblImmagine,0,0,2,1);
        constraints.fill = GridBagConstraints.NONE;
        
        JCheckBox chkImmagine=new JCheckBox("Mantieni Proporzioni");
        addcomponent(chkImmagine,1,0,1,1);
        JLabel lbldirectory=new JLabel("Directory:");
        addcomponent(lbldirectory,2,0,1,1);
        
        
        
        JTextField txtdir=new JTextField();
        constraints.fill=GridBagConstraints.HORIZONTAL;
        addcomponent(txtdir,2,1,1,1);