BCGControlBar Pro for MFC
void CBCGPRibbonSlider::SetTextExt ( LPCTSTR  lpszText,
BOOL  bLockTextSize = FALSE 
)

Specifies a text displayed on the right side of the horizontal slider or on top of the vertical slider.

Parameters
lpszTextThe text.
bLockTextSizeTRUE to lock, FALSE to unlock the text size.