Member variable TBColumn():heading Foundation
Defines the header lines of a column.
A character expression can optionally be assigned to this instance variable. It defines the header line of the column which is displayed by a TBColumn object. A header line is displayed in multiple lines when a semicolon is contained in the character expression (line break character). The character expression for the instance variable :heading can be passed to the class method :new(). If not passed, :heading is NIL.
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