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postBlock (Assignable)
Contains an optional code block that validates a newly entered or
modified value contained within a given cell.. If present, the
TBColumn:postBlock should contain an expression that evaluates to
true (.T.) for a legal value and false (.F.) for an illegal value.
The TBColumn object itself ignores this variable. It is typically
used by the standard READ command.
During postvalidation, the TBColumn:postBlock is passed a reference
to the current Get object as an argument.
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