InstantiateSelection
return InstantiateSelection(&items, dropIndex);
return InstantiateSelection(archive, CountItems());
virtual bool InstantiateSelection(const BMessage*, int32) = 0;
virtual bool InstantiateSelection(const BMessage* archive, int32 dropIndex);
virtual bool InstantiateSelection(const BMessage* archive, int32 dropIndex);
virtual bool InstantiateSelection(const BMessage* archive, int32 dropIndex);
virtual bool InstantiateSelection(const BMessage* archive, int32 dropIndex);