isCOBOL Evolve : User Interface : Controls Reference : CHECK-BOX : Properties : Bitmap-Handle
Bitmap-Handle
This property identifies the bitmap strip handle to be used. If this value is omitted, the control uses the bitmap most recently loaded by W$BITMAP. The Bitmap style must be set.
 
Example - Define a checkbox in screen section with its bitmap handle
working-storage section.
...
77 my-cb-png pic s9(9) comp-4.
...
screen section.
...
03 screen-1-cb-2 Check-Box
   line 27.0
   column 10.0
   size 116
   lines 31
   id 11
   flat
   title "My Check Box"
   bitmap-handle my-cb-png
   bitmap-number 1
   bitmap-width 20
   title-position 2
   bitmap-selected 2
   .
...
procedure division.
...
  call "w$bitmap" using 
        wbitmap-load "my-cb.png" giving my-cb-png.