Prado\Web\UI\WebControls\TDataGridColumn::initializeCell PHP Method

    public function initializeCell($cell, $columnIndex, $itemType)
    {
        if ($itemType === TListItemType::Header) {
            $this->initializeHeaderCell($cell, $columnIndex);
        } else {
            if ($itemType === TListItemType::Footer) {
                $this->initializeFooterCell($cell, $columnIndex);
            }
        }
    }

 /**
  * Initializes the specified cell to its initial values.
  * This method overrides the parent implementation.
  * It creates a textbox for item in edit mode and the column is not read-only.
  * Otherwise it displays a static text.
  * The caption of the button and the static text are retrieved
  * from the datasource.
  * @param TTableCell the cell to be initialized.
  * @param integer the index to the Columns property that the cell resides in.
  * @param string the type of cell (Header,Footer,Item,AlternatingItem,EditItem,SelectedItem)
  */
 public function initializeCell($cell, $columnIndex, $itemType)
 {
     if (!$this->_dataBound && $this->_listControl->getDataSource() !== null) {
         $this->_listControl->setDataTextField($this->getListTextField());
         $this->_listControl->setDataValueField($this->getListValueField());
         $this->_listControl->setDataTextFormatString($this->getListTextFormatString());
         $this->_listControl->dataBind();
         $this->_dataBound = true;
     }
     switch ($itemType) {
         case TListItemType::EditItem:
             if (!$this->getReadOnly()) {
                 $listControl = clone $this->_listControl;
                 $cell->getControls()->add($listControl);
                 $cell->registerObject('DropDownList', $listControl);
                 $control = $listControl;
             } else {
                 $control = $cell;
             }
             $control->attachEventHandler('OnDataBinding', array($this, 'dataBindColumn'));
             break;
         case TListItemType::Item:
         case TListItemType::AlternatingItem:
         case TListItemType::SelectedItem:
             if ($this->getDataTextField() !== '' || $this->getDataValueField() !== '') {
                 $cell->attachEventHandler('OnDataBinding', array($this, 'dataBindColumn'));
             }
             break;
         default:
             parent::initializeCell($cell, $columnIndex, $itemType);
             break;
     }
 }