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preBlock (Assignable)
Contains an optional code block that decides whether editing should
be permitted. If present, the TBColumn:preBlock should evaluate to
true (.T.) if the cursor enters the editing buffer; otherwise, it
should evaluate to false (.F.).
The TBColumn object itself ignores this variable. It is typically
used by the standard READ command.
During prevalidation, the TBColumn:preBlock is passed a reference to
the current Get object as an argument.
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