java - How to change non-editable/generated code in netbeans

Question

I want to change the non-editable code in Netbeans ,
I want to replace the
javax.swing.JTextFeild with ObservingTextField
for which I have a class imported into my project in order to Implement a date picker
But Netbeans Does not allow me to edit the code . Please help

// Variables declaration - do not modify                     
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JPanel jPanel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTable jTable1;
`private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;`
// End of variables declaration   

Answer 1

Another option delete the special comments. You can't see in NetBeans but if you open in other text editor (for example notepad) you will see that comments on the begining and ending of non editable section. The comments look like this:

//GEN-BEGIN:initComponents
//GEN-END:initComponents