Release 10.1A: OpenEdge Development:
Progress 4GL Handbook

ADD-CALC-COLUMN method

The ADD-CALC-COLUMN method creates a single column based on a list of specified properties rather than deriving it from a specific field in a buffer. This is typically used as a placeholder column for a calculated value:

[ column-handle = ] buffer-handle:ADD-CALC-COLUMN      (datatype-exp , format-exp , initial-value-exp , label-exp [ , pos ] )

Here are descriptions of the ADD-CALC-COLUMN options:

column-handle — The handle of the column object returned from the method. You might want to capture this value to associate the column with a ROW-DISPLAY trigger that populates it.
datatype-exp — A literal string or character expression evaluating to the data type for the column.
format-exp — A string or character expression evaluating to the format for the column.
initial-value-exp — A string or expression evaluating to the initial value for the column.
label-exp — A string or expression evaluating to the column label for the column.
pos — The integer position of the new column within the browse display list. If you do specify pos, the column goes at the end of any columns already defined.