void Add ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< class [ISkeletonTreeItem](API\Editor\SkeletonEditor\ISkeletonTreeItem) > & InItem, const [FName](API\Runtime\Core\UObject\FName) & InParentName, std::initializer_list< [FName](API\Runtime\Core\UObject\FName) > InParentTypes, bool bAddToHead )