ExtJS4：表单字段集侦听器

Question

I have ExtJS4 form, and FieldSet there. Fieldset is being controller by CHECKBOX. I need to listen that checkbox change event.

{
                    xtype:"fieldset",
                    width:440,
                    padding:5,
                    title:"1st break",
                    layout:"hbox",
                    name:"irest_first",
                    checkboxToggle:true,
                    items:[{
                        xtype:"timefield",
                        fieldLabel:"something",
                        margin:"0 5 0 0",
                        width:120,
                        labelWidth:30
                    },{
                        xtype:"timefield",
                        fieldLabel:"something",
                        margin:"0 5 0 0",
                        width:120,
                        labelWidth:30                            
                    }]
                }

What listener I need to use? tried collapse and expand, not working.

Answer 1

Sencha removed events for collapse/expand from ExtJs4. They are putting them back in 4.1. If you're using 4.0.x you will have to override collapse method yourself.