How to add a default listener to a FieldSet?

[teedev]

I have a FieldSet which looks like this:

var myFieldSet = new Ext.form.FieldSet;
myFieldSet.title = 'Title goes here';
myFieldSet.defaults = {
  labelWidth : '35%',
  listeners : {
    el : {
      click : function(ctl) {alert('hello')}
     },
     delegate : "input"
  }
 }; 

It works. But I want to add a click listener later per code. It should look like this:

var myFieldSet = new Ext.form.FieldSet;
myFieldSet.title = 'Title goes here';
myFieldSet.defaults = {
  labelWidth : '35%'
};  

....more code....

myFieldSet.defaults.addListener('click', function() {
  alert('hello');
}); 

This dosn't work. The event isn't fired. Please help me. Thanks!

[teedev]

Any ideas? Thx!