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 GetColSizes     Returns an array with all the sizes of the columns
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   TWBrowse::GetColSizes() --> nil

   This METHOD returns an array of the numeric widths for each column.
   It checks if the :aColSize is a CodeBlock or an array and evaluates it
   or just return its value accordingly.

   You may dynamically change the column width for each row. This technique
   is used to browse the FiveWin trees.