.XY SET AG LABEL 
This subroutine turns aggregate labels on or off for the "current" chart layer.
  Usage: 
      PASS         <ag_total_sw>              FIELD            SHARE? N
      GOSUB    0CD .XY SET AG LABEL
      *        Check for error
      IF       0CD .XY SET AG LABEL           NE
  Description: 
This subroutine turns aggregate labels on or off.
The parameter is optional, valid values are: On, Off, True, False. If blank or not passed, the aggregate labels will be turned off.
Aggregate data labels applies to layer types that contains "aggregated data", such as stacked bar layer and stacked area layer. In these layer types, data labels (see 
.XY SET DATA LABEL) represents a single data item, while aggregate labels represents the stacked object.
The aggregate label text box become the "current" text box and subsequent calls to the various .TEXT subroutines may be made to further set/modify it's text attributes.
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-- 
JeanNeron - 2012-01-11