BCGSuite for MFC
void CBCGPComboBox::SetErrorMessage ( LPCTSTR  lpszMessage,
COLORREF  clrText = (COLORREF)-1,
BOOL  bRedraw = TRUE 
)

Sets a custom error message.

Parameters
lpszMessageThe error message text.
clrTextThe error text color.
bRedrawSpecifies whether a control should be redrawn.