cButton 과 cMSButton으로 분리됨
LRESULT cButton::Proc(uint Msg, WPARAM wParam, LPARAM lParam){
switch(Msg){
case BM_SETCHECK: SetCheck(wParam); break;
case BM_GETCHECK:
case BM_GETSTATE:
case BM_SETSTATE:
case BM_SETSTYLE:
case BM_CLICK:
case BM_GETIMAGE:
case BM_SETIMAGE:
case BM_SETDONTCLICK: //assert(false); break; <- 여기서 assert에 걸림,