Implement LBS_COMBOBOX, and make use of it.
Better separation between the Listbox and Combobox.
Have a single set of wndprocs, just like Windows.
diff --git a/include/winuser.h b/include/winuser.h
index 700c4ef..9a242c2 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -2164,6 +2164,7 @@
#define LBS_DISABLENOSCROLL 0x1000
#define LBS_NODATA 0x2000
#define LBS_NOSEL 0x4000
+#define LBS_COMBOBOX 0x8000
#define LBS_STANDARD (LBS_NOTIFY | LBS_SORT | WS_VSCROLL | WS_BORDER)
/* Listbox messages */