BCGControlBar Pro for MFC
void CBCGPGridColorItem::EnableAutomaticButton ( LPCTSTR  lpszLabel,
COLORREF  colorAutomatic,
BOOL  bEnable = TRUE 

Shows or hides the automatic button for the color picker.

Use this method to allow the drop-down color picker either display the automatic button, or hide the automatic button.

lpszLabelThe text of automatic button.
colorAutomaticThe color of automatic button.
bEnableIf TRUE, the automatic button will be displayed. If FALSE, the automatic button will be hidden.