/**
  * Return column block values for given custom column
  * 
  * @param string $index Column index
  * @param BL_CustomGrid_Model_Custom_Column_Abstract $customColumn Custom column model
  * @param string $rendererType Renderer type code
  * @param array $rendererParams Renderer parameters
  * @param string $customParams Encoded customization parameters
  * @param Mage_Core_Model_Store $store Current store
  * @param Mage_Adminhtml_Block_Widget_Grid Grid block
  * @retrn 
  */
 protected function _getCustomColumnGridValues($id, $index, $customColumn, $rendererType, $rendererParams, $customParams, $store, $block)
 {
     if ($customColumn->getAllowRenderers()) {
         if ($customColumn->getLockedRenderer() && $customColumn->getLockedRenderer() != $renderer) {
             $rendererType = $customColumn->getLockedRenderer();
             $rendererParams = array();
         }
         $renderer = Mage::getSingleton('customgrid/column_renderer_collection')->getRendererInstanceByCode($rendererType, $rendererParams);
     } else {
         $renderer = null;
     }
     if (!empty($customParams)) {
         $customParams = Mage::getSingleton('customgrid/grid_type')->decodeParameters($customParams);
         $customParams = is_array($customParams) ? $customParams : array();
     } else {
         $customParams = array();
     }
     return $customColumn->applyToGridBlock($block, $this, $id, $index, $customParams, $store, $renderer);
 }