diff -r 47ae980bace3 -r f2491d3c321b src/timetable_gui.cpp
--- a/src/timetable_gui.cpp	Tue May 06 21:28:30 2008 +0000
+++ b/src/timetable_gui.cpp	Tue May 06 22:08:18 2008 +0000
@@ -245,7 +245,7 @@
 					break;
 			}
 
-			SetWindowDirty(w);
+			w->SetDirty();
 		} break;
 
 		case WE_ON_EDIT_TEXT: {