From Tracker Software PDF SDK
Adds an existing bookmark as a child to the bookmark's sub-tree.
HRESULT AddChild([in] IPXC_Bookmark* pChild, [in] VARIANT_BOOL bLast);
- [in] Pointer to IPXC_Bookmark containing the child to be added to the sub-tree.
- [in] Choose whether the inserted child should be last or first in the bookmark's sub tree.
Returns S_OK if the operation was successful, or will return an error code if it fails.