private Inicio() {
        
        //this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        setUndecorated(true);  

        try {
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
            SwingUtilities.updateComponentTreeUI(this);
            this.pack();
            this.setIconImage(new ImageIcon(getClass().getResource("air_tickets.png")).getImage());
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
            JOptionPane.showMessageDialog(this, "Ha ocurrido un error.");
        }

        initComponents();
        this.setTitle("Oris-TKT");
        this.setLocationRelativeTo(null);
        this.setVisible(true);
        this.setResizable(false);
        //this.setIconImage(new ImageIcon(getClass().getResource("avion.png")).getImage());
    }