How to overlay two ASButton(absolute position) to ASCollectionNode?

Question

Struct:

• ASScrollNode(Stack vertical layout)
  • ASCollectionNode(without layoutSpecThatFits)
  • ASButtonNode, ASButtonNode (absolute position)

I want the buttons to be displayed on ASCollectionNode (and not moved when scrolling the collection). How could I do that?

I tried to use ASOverlayLayoutSpec and new wrap node, but no one displaying.