$this->_removeButton('add');

public function getRowUrl($row)
{
    // This is where our row data will link to
    return $this->getUrl('*/*/edit', array('id' => $row->getId()));
}

public function getRowUrl($row)
{
    return false;
}

public function getRowUrl()
{
    return $this->getUrl('*/*/yourAction', array('id' => $row->getId()));
}