BCGControlBar Pro for MFC
BOOL CBCGPToolbarButton::m_bWrap

If this flag is TRUE for a separator, the next to the separator button will be placed on the next row.

The m_bWrap member variable forces a toolbar to be wrapped, if this flag is set to TRUE for a button with TBBS_SEPARATOR style and the toolbar is docked horizontally or floating. By default, this value is FALSE.