BCGControlBar Pro for MFC
void CBCGPRibbonSlider::EnableProgressMode ( BOOL  bEnable = TRUE,
COLORREF  clrProgress = CLR_DEFAULT 
)

Specifies whether the Ribbon slider has a progress mode.

Parameters
bEnableTRUE to enable, FALSE to disable.
clrProgressThe progress background color.

In the progress mode, the channel area left of the slider's thumb is filled with some (default or user-defined) color.