public function render(Varien_Object $row) { $_customer_group = array(); $output = null; $customer_group = new Mage_Customer_Model_Group(); $allGroups = $customer_group->getCollection()->toOptionHash(); foreach ($allGroups as $key => $allGroup) { $_customer_group[$key] = $allGroup; } $selection = explode(',', $row->getCustomerGroup()); if (in_array('-1', $selection) || count($selection) < 1) { echo Mage::helper('pointofsale')->__("No Customer Group"); return; } else { foreach ($selection as $v) { $output .= $_customer_group[$v] . "<br>"; } } echo $output; return; }