How to clear last search criteria in ADF form?

I'm building an ADF form. This form uses JTextField controls. When I switch to Find Mode, I want to clear criteria of the last search that JDev remembered. I've tried to remove ActionListener of FIND button in Navigation Bar, then add a new ActionListener that I created to handle FIND action myself. But the results are not perfect as I expected: JDev still filled the last search criteria.
For example, I searched with these criteria: Code = 'ABC', the next time enter Find Mode, I want this criteria to be cleared. My code is below:
JButton btnFind = navApplication.getButton(navApplication.BUTTON_FIND);
btnFind.removeActionListener(navApplication);
btnFind.addActionListener(new ActionListener(){
       public void actionPerformed(ActionEvent e)
     navApplication.doAction(navApplication.BUTTON_FIND);
     if (navApplication.getModel().isFindMode())
          txtCode.setText("");
          txtName.setText("");
          txtAddress.setText("");
});

Hi,
Could, some body please answer to my question I raised above.
Cheers,
Krishna.

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