Label and Button in VBox, how to dynamically insert something between them?

I'm probably missing something simple here, but scratching my head. If I have a VBox with a label and a button in it, is there no way to insert a new child between the other two children ? Something like a way to get at "nth child"? or "insertAtIndex" ? Most likely I am just thinking about this wrong-headedly. Thanks.

ah, so .add() takes an int which determines the position among the children in which it will be inserted? I knew I was completely missing something critically simple. Thank you.

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