gchar* data = "Some random data";

g_object_set(window,
  "resizable", FALSE,/* GtkWindow-property */
  "has-focus", TRUE, /* GtkWidget-property */
  "width", 300,      /* GtkWidget-property */
  "height", 150,     /* GtkWidget-property */
  "user-data", data, /* GObject-property */
  NULL);
