GoTopBlock                                       (Assignable)

        Contains a code block that is executed in response to the
        TBrowse:GoTop() message.  This block is responsible for repositioning
        the data source to the first record displayable in the browse.
        Typically the data source is a database file, and this block contains
        a call to a user-defined function that executes a GO TOP command.

        oTB:GoTopBlock    := {|| GoTopDB(@nLine)}

        FUNCTION GoTopDB( nLine )
           DBGoTop()
           nLine := 1
        RETURN (NIL)