I do it like upon,but error, please help me! Thanks !
In my opinion, there are still some design flaws in this ID Generator. To move your selections to be displayed first, change your "create" stylesheet for this item. Just note, you can't remove the Item ID or it breaks.
Here is my working example updated to mimic your properties:
Change your "Fnd0BaseIDGenerator" to "fnd0IDGenerator". Basically change the uppercase "F" to lowercase and remove "Base".