# -Q2.D.6- have a listbox only allow the selection of a single item

    From: -II-  Tk Questions and Answers - How can I:
    at a time?

    A2.D.6. See the man page for the tk command "tk_listboxSingleSelect".  An
    invocation such as the following:

        listbox .l
        tk_listboxSingleSelect .l

    will modify the bindings of the widget .l so that only a single item of
    the listbox can be selected at a time.

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