--- a/ui/gtk/window.c	Wed Jul 13 16:40:59 2016 +0200
+++ b/ui/gtk/window.c	Sat Sep 17 19:32:44 2016 +0200
@@ -68,6 +68,7 @@
     UiObject *obj = ucx_mempool_calloc(mp, 1, sizeof(UiObject));  
     obj->widget = gtk_window_new(GTK_WINDOW_TOPLEVEL);
     obj->ctx = uic_context(obj, mp);
+    obj->window = window_data;
     
     if(title != NULL) {
         gtk_window_set_title(GTK_WINDOW(obj->widget), title);