protected function CreateFilterControl($strControlId, QDataGridColumn $objColumn)
 {
     //show the current filter in the control
     $value = $objColumn->GetActiveFilterValue();
     #region Create the control
     //create the appropriate kind of control
     $actionName = 'btnFilter_Click';
     $ctlFilter = null;
     switch ($objColumn->FilterType) {
         default:
         case QFilterType::TextFilter:
             $ctlFilter = $this->filterTextBox_Create($strControlId, $objColumn->Name, $objColumn->FilterBoxSize, $value);
             break;
         case QFilterType::ListFilter:
             $ctlFilter = $this->filterListBox_Create($strControlId, $objColumn->Name, $objColumn->FilterList, $value);
             break;
     }
     #endregion
     if (null !== $ctlFilter) {
         //make sure hitting enter applies the filter
         if ($this->blnUseAjax) {
             $ctlFilter->AddAction(new QEnterKeyEvent(), new QAjaxControlAction($this, $actionName, $this->objWaitIcon));
         } else {
             $ctlFilter->AddAction(new QEnterKeyEvent(), new QServerControlAction($this, $actionName));
         }
         $ctlFilter->AddAction(new QEnterKeyEvent(), new QTerminateAction());
     }
     return $ctlFilter;
 }