protected function _prepareCollection()
{
$vendor_id = $this->_getVendorIds();
if (sizeof($vendor_id) > 0) {
$vendor_id = $vendor_id[0];
if (Mage::registry('vendor_id')) {
Mage::unregister('vendor_id');
}
Mage::register('vendor_id', $vendor_id);
}
parent::_prepareCollection();
}
