BCGControlBar Pro for MFC
void CBCGPSliderCtrl::SetReversedOrder ( UINT  nReversedOrder = BCGP_SLIDER_REVERSED_VERTICAL)

Specifies whether slider's ticks have a reversed order.

Parameters
nReversedOrderCombination of the following flags: BCGP_SLIDER_REVERSED_VERTICAL and BCGP_SLIDER_REVERSED_HORIZONTAL or 0.