--- a/functions.h	Thu Jan 13 16:28:47 2005 +0000
+++ b/functions.h	Thu Jan 13 16:50:20 2005 +0000
@@ -201,6 +201,7 @@
 void InvalidateWindowWidget(byte cls, WindowNumber number, byte widget_index);
 void InvalidateWindowClasses(byte cls);
 void DeleteWindowById(WindowClass cls, WindowNumber number);
+void DeleteWindowByClass(WindowClass cls);
 
 void SetObjectToPlaceWnd(int icon, byte mode, Window *w);
 void SetObjectToPlace(int icon, byte mode, WindowClass window_class, WindowNumber window_num);