BCGControlBar Pro for MFC
void CBCGPPlannerManagerCtrl::SetMultiDayLessThan24 ( BOOL  bLessThan24,
BCGP_PLANNER_TYPE  view = (BCGP_PLANNER_TYPE)-1 
)

Sets the Planner Control how to display multi-days appointments with duration less than 24 hours - in one or two bars.

Parameters
bLessThan24TRUE, if appointment should be displayed in one bar; FALSE - in two.
viewThe planner type (-1 - default).