This makes the question infobar activatable by clicking
anywhere in it.
gtk_label_set_wrap (GTK_LABEL (label), TRUE);
gtk_label_set_xalign (GTK_LABEL (label), 0);
gtk_container_add (GTK_CONTAINER (gtk_info_bar_get_content_area (GTK_INFO_BAR (bar))), label);
+ gtk_info_bar_set_default_response (GTK_INFO_BAR (bar), GTK_RESPONSE_OK);
button = gtk_toggle_button_new_with_label ("Question");
g_object_bind_property (bar, "revealed", button, "active", G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE);