BCGControlBar Pro for MFC
BOOL CBCGPToolBar::SetButtonText ( int  nIndex,
LPCTSTR  lpszText 
)

Sets a new text label for a toolbar button.

Returns
Nonzero if successful; otherwise 0.

Call this function to assign a new text label to a toolbar button.

Parameters
nIndexA toolbar button index.
lpszTextA new text to set.