BCGControlBar Pro for MFC
BOOL CBCGPComboBox::SetImageList ( UINT  nImageListResID,
int  cxIcon = 16,
int  nVertMargin = 2,
BOOL  bAutoScale = FALSE,
BOOL  bDisplayIconLeftOfEditBox = FALSE 
)

Sets image list.

Parameters
nImageListResIDIdentifier for the image list resource.
cxIconThe icon width.
nVertMarginThe icon vertical margin.
bAutoScaleTRUE to automatically scale according to DPI.
bDisplayIconLeftOfEditBoxIf this parameter is TRUE and selected combobox item has icon, the icon will be displayed on left side (CBS_DROPDOWN style).
Returns
TRUE if it succeeds, FALSE if it fails.