Izzy:

> Is there a way to use A to add {text "Bye!"} to it, as
>  if I had instead typed:

In a word, make-face.

LO: layout/size [button "hi"] 500x500
unview/all
view/new LO
append LO/pane make-face 'button
LO/pane/2/text: "bye"
show LO/pane/2
show LO

Of course, it needs some work on positioning the new element right, among 
other things.  And you may need to reorder the Z-index (rendering is in order of 
entries in LO/pane, so moving those around affects what items overlay others).

Sunanda
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