How about moving one line of code from getGridData into serviceResultHandler, 
something like:

   private function getGridData():void
   {
    CursorManager.setBusyCursor();
    var service:WebService = new WebService();
    
    service.addEventListener(ResultEvent.RESULT, serviceResultHandler);
    service.addEventListener(FaultEvent.FAULT, serviceFaultHandler);
    service.loadWSDL("http://localhost:55841/Service1.asmx?WSDL";);
    service.RetrieveSuppliers2();
   }
   
   private function serviceResultHandler(event:ResultEvent) :void
   {
    CursorManager.removeBusyCursor();
    _xmlData = XML(event.result);
    arrDP = new ArrayCollection(mx.utils.ArrayUtil.toArray(_xmlData));
    this.MydataGrid.visible = true;
   }

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