ComboBox inside menu item

Hy Guys
How can insert a combobox inside a menu item?
anyone can help me?

thanks

this code dosen't work...:(

Code:

---

menu: {ignoreParentClicks: true,
                                items:[{
                            text: '',
                            handler: function(obj, e){
                           
                            }
                        },{
                        xtype:"combo",
                        width:100,
                            listWidth:100,
                            forceSelection: true,
                            store: TypesStore,
                            editable:false,
                            valueField: 'value',
                            displayField: 'name',
                            hideLabel:true,
                            allowBlank:false,
                            typeAhead: true,
                            mode: 'local',
                            triggerAction: 'all'
                    }]}

---

You need to select a different parent for the combobox list, e.g.

Code:

---

{
  xtype: 'combo',
  ...
  getListParent: function() {
    return this.el.up('.x-menu');
  }
}

---

(which unfortunately doesn't work on Ext 2, because this feature request was only implemented for Ext 3)

try Ext.menu.CheckItem

I have the same problem when try to insert a trigger field in a menu, i don't understand if in this version i can put it after modify a extjs with some fix.
Otherwise, there is a possibility to show a panel below a button item?
Thanks in advance