A button created with the bs_ownerdraw style is an ownerdraw button. A listbox created with lbs_ownerdrawfixed style is an ownerdraw listbox.
A control with ownerdraw style displays a picture from a file. The files supported are the same types supported for the pictures in isipicture class windows.
The file names to display are set with the set command.
For example, the following will display an ownerdraw button with the J icon:
wd 'pc abc; xywh 10 10 30 30' wd 'cc b1 button bs_ownerdraw' wd 'cn "system\examples\data\jb.ico"' wd 'pas 10 10; pshow'