I love to work with NetBeans for designer. But one
thing I have (not NetBeans, but every form
designer I seen today), is mixing form design code
AND logic code.
To address this issue, the method calls for event
handling should have a config option to be
generated abstract. So, I will extend the UI class
and implement logic code, implementing all calls.
Actually the variables already can be declared
protected, so I can access them. The only piece
are missed is abstract methods.

Example:

btnCancel.addActionListener(new
java.awt.event.ActionListener() {
      public void
actionPerformed(java.awt.event.ActionEvent evt) {
        btnCancelActionPerformed(evt);
      }
    });
.
.
.
  private void
btnCancelActionPerformed(java.awt.event.ActionEvent
evt) {
    // Add your handling code here:
    this.documento = null;
    doClose();
  }

should be

btnCancel.addActionListener(new
java.awt.event.ActionListener() {
      public void
actionPerformed(java.awt.event.ActionEvent evt) {
        btnCancelActionPerformed(evt);
      }
    });
.
.
.
  protected abstract void
btnCancelActionPerformed(java.awt.event.ActionEvent
evt);

(The method could be protected, or public... It
should be configurable too).

This will solve my trouble regarding guarded
blocks too.

Thanks,

Edson Richter