Implemented {G|S}etWindowSubClass, DefSubclassProc,
RemoveWindowSubclass.
diff --git a/include/commctrl.h b/include/commctrl.h
index 33fdda1..3fc7573 100644
--- a/include/commctrl.h
+++ b/include/commctrl.h
@@ -677,6 +677,12 @@
BOOL WINAPI InitializeFlatSB(HWND);
HRESULT WINAPI UninitializeFlatSB(HWND);
+/* Subclassing stuff */
+typedef LRESULT (CALLBACK *SUBCLASSPROC)(HWND, UINT, WPARAM, LPARAM, UINT_PTR, DWORD_PTR);
+BOOL WINAPI SetWindowSubclass(HWND, SUBCLASSPROC, UINT_PTR, DWORD_PTR);
+BOOL WINAPI GetWindowSubclass(HWND, SUBCLASSPROC, UINT_PTR, DWORD_PTR*);
+BOOL WINAPI RemoveWindowSubclass(HWND, SUBCLASSPROC, UINT_PTR);
+LRESULT WINAPI DefSubclassProc(HWND, UINT, WPARAM, LPARAM);
/* Header control */
