Called by the framework to retrieve the IDispatch interface of the object's parent.
Receives the address of the parent object's IDispatch interface. The variable is set to NULL if no parent exists, or if the child cannot access its parent.
Returns S_OK on success, a COM error code on failure. See Return Values in IAccessible::get_accParent in the Platform SDK.
This function is part of MFC'ssupport.
In most cases you don't have to override this function.
For more information, see IAccessible::get_accParent in the Platform SDK.