TBColumn -- Overview
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 Class Function

 TBColumnNew()   Create a new TBColumn object
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 Exported Instance Variables

 block           Code block to retrieve data for the column
 cargo           User-definable variable
 colorBlock      Code block that determines color of data items
 colSep          Column separator character
 defColor        Array of numeric indexes into the color table
 footing         Column footing
 footSep         Footing separator character
 heading         Column heading
 headSep         Heading separator character
 width           Column display width