Bitmap-Number
This property identifies which bitmap (among the ones in the bitmap strip referenced by the Bitmap-Handle property) is to be displayed on the tab identified by the Tab-Index property.
When the values are enclosed between parentheses, the Tab-Index property is ignored, the 1st value refers to the 1st Tab, the 2nd value refers to the 2nd Tab and so on.
The bitmap is shown before the page title.
 
Example - Modify a tab-control to assign a bitmap number to each page
procedure division.
...
  modify screen-1-tc-1
         tab-to-add ( "Page-1" "Page-2")
         bitmap-number ( 3 2)
         .
...