protected function _prepareCollection()
 {
     $collection = Mage::getModel('worldview_article/article')->getCollection();
     $source_table = $collection->getResource()->getTable('worldview_source/entity');
     $collection->getSelect()->join(array('source' => $source_table), 'source.entity_id=main_table.feed_source_id', array('source.name' => "name"));
     $this->setCollection($collection);
     return parent::_prepareCollection();
 }
 protected function _prepareCollection()
 {
     $collection = Mage::getModel('worldview_source/source')->getCollection();
     $this->setCollection($collection);
     return parent::_prepareCollection();
 }