Help!!! dirtychange of form.panel only fires for the first time?

[CaryLi]

Dear friends,

I had a form.panel and in the controller I need to listen the change event of this form:

so in the controller:

'TestForm': {
dirtychange: function (form, isDirty) {
if (isDirty) {
alert('test')
}
}
},

my view level:

Ext.define('mytest.TestForm', {
requires: [ 'Ext.form.Panel', 'CAS.reportingAdmin.model.Report' ],
extend: 'Ext.form.Panel',
alias: 'widget.TestForm',
title: 'TestForm',
header: false,
defaults:{
xtype: 'textfield',
style: 'margin-left:5px;\r\npadding:5px 2px 2px 2px;',
border: false,
columnWidth: 1,
maxHeight: 25,
anchor: '80%',
labelWidth: 240,
labelStyle: 'font-weight: bold',
labelAlign: 'left',
layout: {
type: 'anchor'
}
},
config: {
layout: {
type: 'anchor'
},
padding: 5,
items: [
{
fieldLabel: ' Name',
name: 'tName',
},
],
buttons: [
{
id: 'saveBtnId',
style: 'float:right;',
height: 25,
margin: '10px',
width: 100,
text: 'Save',
scope: this,
action: 'save',
disabled: 'true'
}
]
}
});


the dirtychange event only fires for one time , actually for the first time , anyone can help?
Really really appreciate...

Regards,
Cary

[CaryLi]

More Detail:

I tried use reset() method to reset the form panel, then the dirtychange can fires everytime, but the new added stuff to the form field is not there, so I can't use reset.
but the reset can really promote the dirtychange, so I am wondering what the stuff reset did for the form?

and I searched from google, use this way || basicForm.owner.getForm().trackResetOnLoad = true; but the dirtychange still fires for only once? I spent a lot of time on it , please help???