--- a/newgrf_gui.c	Mon Dec 04 18:57:09 2006 +0000
+++ b/newgrf_gui.c	Mon Dec 04 20:27:53 2006 +0000
@@ -299,6 +299,10 @@
 			break;
 		}
 
+		case WE_INVALIDATE_DATA:
+			SetupNewGRFWindow(w);
+			break;
+
 		case WE_CLICK:
 			switch (e->we.click.widget) {
 				case 3: { /* Add GRF */