This function sets the colors to be used by a control window. See Colors Used by PM Controls.

#define INCL_WINSYS /* Or use INCL_WIN, INCL_PM, */
#include <os2.h>

HWND         hwnd;       /*  Window handle. */
LONG         clrType;    /*  Control color index. */
ULONG        fCtlColor;  /*  Control Color Flags. */
ULONG        cCtlColor;  /*  Number of items being passed in pCtlColor. */
PCTLCOLOR    pCtlColor;  /*  Array of control colors, each comprising an index and value pair. */
LONG         rc;         /*  Number of control colors returned in pCtlColor. */

rc = WinSetControlColors(hwnd, clrType, fCtlColor,
       cCtlColor, pCtlColor);