I agree that it looks a little odd without the closing brace
SetFoldFlag(flag) method of wxscintilla might do the job you need. the flags are:
#define wxSCI_FOLDFLAG_LINEBEFORE_EXPANDED 0x0002
#define wxSCI_FOLDFLAG_LINEBEFORE_CONTRACTED 0x0004
#define wxSCI_FOLDFLAG_LINEAFTER_EXPANDED 0x0008
#define wxSCI_FOLDFLAG_LINEAFTER_CONTRACTED 0x0010
#define wxSCI_FOLDFLAG_LEVELNUMBERS 0x0040
#define wxSCI_FOLDFLAG_BOX 0x0001
I haven't tested to see if any of these actually will do what you need
a lot of the editor custom config is done around line 940 of cbeditor.cpp