I am working on a patch for C::B to fix the following issues for disable compat26 under wxWidgets 2.8.
From wx/toplevel.h (wxWidgets 2.6.1)
// deprecated versions defined for compatibility reasons
#define wxRESIZE_BOX wxMAXIMIZE_BOX
#define wxTHICK_FRAME wxRESIZE_BORDER
// obsolete styles, unused any more
#define wxDIALOG_MODAL 0
#define wxDIALOG_MODELESS 0
#define wxNO_3D 0
#define wxUSER_COLOURS 0
From wx/toplevel.h (wxWidgets cvs head)
#if WXWIN_COMPATIBILITY_2_6
// deprecated versions defined for compatibility reasons
#define wxRESIZE_BOX wxMAXIMIZE_BOX
#define wxTHICK_FRAME wxRESIZE_BORDER
// obsolete styles, unused any more
#define wxDIALOG_MODAL 0
#define wxDIALOG_MODELESS 0
#define wxNO_3D 0
#define wxUSER_COLOURS 0
#endif // WXWIN_COMPATIBILITY_2_6