diff -r 7a36f91c22f7 -r a499c8a72c15 ui/gtk/button.c
--- a/ui/gtk/button.c	Tue Apr 01 11:50:32 2014 +0200
+++ b/ui/gtk/button.c	Tue Apr 01 11:53:10 2014 +0200
@@ -44,6 +44,7 @@
         event->obj = obj;
         event->user_data = data;
         event->callback = f;
+        event->value = 0;
 
         g_signal_connect(
                 button,
@@ -64,6 +65,7 @@
     e.obj = event->obj;
     e.window = event->obj->window;
     e.document = event->obj->document;
-    e.intval = 0;
+    e.eventdata = NULL;
+    e.intval = event->value;
     event->callback(&e, event->user_data);
 }