BCGControlBar Pro for MFC
void CBCGPColorBar::EnableOtherButton ( LPCTSTR  lpszLabel,
BOOL  bAltColorDlg = TRUE,
BOOL  bEnable = TRUE 

Enables ability to show a new dialog box to select an alternative color

Call this member function to enable or disable an "other color" dialog box, as well as what is the type of the color dialog: standard (CColorDialog) or provided by BCGControlBar Library (CBCGPColorDialog).

lpszLabelSpecifies the "other button" label
bAltColorDlgSpecifies whether the standard color dialog should be invoked
bEnableEnables or disables the "other" button