grouptabpanel: adding a group help!!

[s.panico]

Hi guys,
please help me, i'm going crazy!! I need to add a group (and its sub group) to a grouptabpanel dynamically at runtime... i wrote this:

var struct1 = new Ext.ux.GroupTabPanel({
       xtype: 'grouptabpanel',
       tabWidth: 130,
       activeGroup: 0,
       items: [
           {
               mainItem: 1,
               items: [
                   {
                       title: 'Tickets',
                       layout: 'fit',
                       iconCls: 'x-icon-tickets',
                       tabTip: 'Tickets tabtip',
                       style: 'padding: 10px;',
                       items: [new SampleGrid([0,1,2,3,4])]
                   },
                   {
                       xtype: 'portal',
                       title: 'Home',
                       tabTip: 'Home page',
                       items: [{
                           title: 'Body Home',
                           contentEl: 'myContent'
                       }]
                   }
               ]
           }
       ]
   });
   new Ext.Panel({
       layout: 'fit',
       renderTo: 'myContainer',
       height:400,
       items: struct1
   });

//try to add new group

var gtab = new Ext.ux.GroupTab ({
 xtype: 'grouptab',
 items:[{
  id:'myitem',
       title: 'NewItem',
       html: 'A simple tab',
       items: [{
         layout: 'fit',
         title: 'Tab 2',
         html: 'Sub-tab one'}]
   }]

});

struct1.add(gtab);

but i get this (bad) firebug raise me this exception:

"this.itemTpl is undefined"

Can anyone can help me to solve this tedious issue??

Thanx a lot
Best regards
Sergio

[mikekanani]

I am having the same issue, did you find out how to solve this?