BCGControlBar Pro for MFC
void CBCGPSliderCtrl::EnableProgressMode ( BOOL  bEnable = TRUE,
COLORREF  clrProgress = (COLORREF)-1,
BOOL  bRedraw = TRUE 
)

Enables the progress mode.

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

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

Parameters
bRedrawSpecifies whether a control should be redrawn.