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