ExtJs Fieldset Collapsed issue

I have a fieldset with the option checkboxTog开发者_Python百科gle:true. When the user checks/unchecks the checkbox, I don't want the fieldset to expand/collapse.

How can I accomplish this?

Thanks in Advance

---

You can implement the beforecollapse event on the fieldset like in the code below. But this way you won't be able to collapse the fieldset.

Setting collapsible: false doesn't seem to work.

xtype:'fieldset',
checkboxToggle:true,
title: 'User Information',
autoHeight:true,
defaults: {width: 210},
defaultType: 'textfield',
items :[{
        fieldLabel: 'First Name',
        name: 'first',
        allowBlank:false
    },{
        fieldLabel: 'Last Name',
        name: 'last'
    },{
        fieldLabel: 'Company',
        name: 'company'
    }, {
        fieldLabel: 'Email',
        name: 'email',
        vtype:'email'
    }
],
listeners: {
    beforecollapse : function(p) {
        return false;
    }
}

---

or override Fieldset

Ext.override( Ext.form.FieldSet, {

    onCheckChange: function(cmp, checked) {
        if(this.collapsible) this.setExpanded(checked);
    }

});