Popup Menus in Listbox Cells

[Robert Steely <robsteely@gmail.com>]

>From reading the language reference listbox entry, this doesn't appear
currently possible.
I need to add a popup menu temporarily to a listbox cell to ensure the user
populates the cell with a valid string value. Once the user selects an item
>from the popup menu, I would remove the popup and place the corresponding
string in the cell as non-editable.

I suppose, I could put text in the cell telling the user to <click here to
add item> and then bring up a separate dialog allowing the user to select a
valid entry from a listbox, but that doesn't seem very elegant or efficient
to me.

How have others solved this problem?

Bob
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