Access to managed bean

[[EMAIL PROTECTED]]

I would like to access in the Action class to the managed bean 
class.
How can I do this?

<managed-bean>

   <managed-bean-name>overviewBean</managed-bean-name>

</managed-bean>

In the action listener I would like to access to the managed bean

public class ExecuteActionListener implements ActionListener {

    public void processAction(ActionEvent event) 
         throws AbortProcessingException {

          HOW TO ACCESS TO THE overviewBean INSTANCE?
    }

}

Thanks

Urs