private void thrgFocusLost(java.awt.event.FocusEvent evt) {
        EventQueue.invokeLater(new Runnable() {
public void run() {
        Long hrg ;
        hrg = (Long)thrg.getValue();
        System.out.println(hrg);
        if (hrg != null && hrg < 0) { 
            JOptionPane.showMessageDialog(this, "Kolom ini Harus di Isi Numerik", "Informasi", JOptionPane.INFORMATION_MESSAGE);            
            thrg.setText("");
            thrg.requestFocus();
        }        
}
});
    }