I asked about this before and I think at the moment there isn't a good
way to do it for real. I solve the problem by simply holding the
Return key down for a good bit, which works well enough for class.
There are some other areas where it would be useful to be able to
clear. For instance, the -twoway- dialog box would benefit from a
delete button. Ditto -mi- with imputation methods. You can disable but
not delete.
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