private function _addTab($sPageSlug, $aTabDefinition)
{
$this->oFactory->addInPageTabs($sPageSlug, $aTabDefinition + array('tab_slug' => null, 'title' => null, 'parent_tab_slug' => null, 'show_in_page_tab' => null));
if ($aTabDefinition['tab_slug']) {
add_action("load_{$sPageSlug}_{$aTabDefinition['tab_slug']}", array($this, 'replyToLoadTab'));
add_action("do_{$this->sPageSlug}_{$this->sTabSlug}", array($this, 'replyToDoTab'));
add_action("do_after_{$this->sPageSlug}_{$this->sTabSlug}", array($this, 'replyToDoAfterTab'));
add_filter("validation_{$this->sPageSlug}_{$this->sTabSlug}", array($this, 'validate'), 10, 4);
}
}