BCGControlBar Pro for MFC
void CBCGPCalendar::SetSingleMonthMode ( BOOL  bSingleMonth = TRUE)

Switches between single and multiple month mode.

If you set the single month mode, the calendar control displays only one month, disregard the client size. If you set the multiple month mode, the calendar control displays as many months as it can to fit the client size.

Parameters
bSingleMonthTRUE - set the single month mode. FALSE - set the multiple month mode.