BCGControlBar Pro for MFC
BOOL CBCGPTabWnd::IsFlatFrame ( ) const
inline

Tells whether the frame around the tabs area is flat or 3D

Returns
Nonzero if the frame around the tabs area is flat; 0 if the frame is 3D.

Call this function to determine whether the frame around the tabs area is 3D or flat. Use SetFlatFrame() to change this flag.