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

Enables and disables "automatic" button that appears above the regular color buttons.

Call this function to enable and disable "automatic" button and set the automatic color to the specified by colorAutomatic color.

lpszLabelSpecifies the automatic button's text.
colorAutomaticAn RGB value that specifies the automatic button's default color.
bEnableSpecifies whether the automatic button is enabled or disabled.