related 2 ComboBox after removeAll() removes font styles

Hi,

I have two related comboBox on the stage

First ones instance name is grp_cb

Second ones instance name is altGrp_cb

They load data from XML...

When they first load their text format are as I coded.

But after I change the first one second ones text format disappears...

After B Blok selected

Related part of my code

grpTf = new TextFormat();
grpTf.size = 18;

function cbXml()
  {
   var XMLLoader:URLLoader = new URLLoader();
   var grpURL:URLRequest = new URLRequest("../genel/girisimGrp.xml");
   XMLLoader.addEventListener(Event.COMPLETE, xmlLoaded);
   XMLLoader.load(grpURL);
  }

  function xmlLoaded(evt:Event):void
  {

   var result:XML=new XML(evt.target.data);
   var grpXML:XMLDocument=new XMLDocument();
   grpXML.ignoreWhite=true;
   grpXML.parseXML(result.toXMLString());
   //trace(grpXML);
   var node:XMLNode = grpXML.firstChild;
   var grpNum:int = int(node.firstChild.childNodes.length);
   //trace(grpNum);
   for (var i:int=0; i < grpNum; i++)
   {
    grp_arr.push(node.firstChild.childNodes.attributes["label"]);

    var altGrpNum:int = int(node.firstChild.childNodes.childNodes.length);

    var my_array_1:Array=new Array();
    for (var j:int=0; j < altGrpNum; j++)
    {
     my_array_1.push(node.firstChild.childNodes.childNodes.firstChild.nodeValue);
    }
    altGrp_arr.push(my_array_1);
   }
  
  
   //trace(altGrp_arr);
  
   populateGrpCb();
   populateGrpCb2();
  }

  private function populateGrpCb():void
  {
   for (var i:int=0; i < grp_arr.length; i++)
   {
    grp_cb.addItem({label:grp_arr,data:i.toString()});
   }

  
   grp_cb.selectedIndex = 0;
   grpVar = grp_cb.selectedItem.label;
   trace(grpVar);

   grp_cb.textField.setStyle("textFormat",grpTf);
   grp_cb.dropdown.setRendererStyle("textFormat", grpTf);
   grp_cb.textField.setStyle("disabledTextFormat", grpTf);

   grp_cb.addEventListener(Event.CHANGE,grpChangeHandler);
  }

  private function grpChangeHandler(evt:Event):void
  {
   grpVar = evt.currentTarget.selectedItem.label;
   trace(grpVar);
   id = evt.target.selectedItem.data;
  
   populateGrpCb2();
  }

  private function populateGrpCb2():void
  {
   altGrp_cb.removeAll();
  
   for (var i:int=0; i < altGrp_arr[id].length; i++)
   {
    altGrp_cb.addItem({label:altGrp_arr[id],data:i.toString()});
   }
  
   altGrp_cb.selectedIndex = 0;
   altGrpVar = altGrp_cb.selectedItem.label;
   trace(altGrpVar);

   altGrp_cb.addEventListener(Event.CHANGE, altGrpChangeHandler);
  
   altGrp_cb.textField.setStyle("textFormat",grpTf);
   altGrp_cb.dropdown.setRendererStyle("textFormat", grpTf);
   altGrp_cb.textField.setStyle("disabledTextFormat", grpTf);
  
  }

  private function altGrpChangeHandler(evt:Event):void
  {
   altGrpVar = evt.currentTarget.selectedItem.label;
   trace(altGrpVar);
  
  
   altGrp_cb.textField.setStyle("textFormat",grpTf);
   altGrp_cb.dropdown.setRendererStyle("textFormat", grpTf);
   altGrp_cb.textField.setStyle("disabledTextFormat", grpTf);
  }

----------------------------------------------------------------------------------------------------------------------------------

I thing the problem is related to removeAll() function...

Any idea, how can I have my comboBox text format back????

Thanks