diff --git a/contain.c b/contain.c
index 0dedbc4..7d2f614 100644
--- a/contain.c
+++ b/contain.c
@@ -177,26 +177,28 @@ void window_header_bar (GtkWindow *main_window, char *title){
   GtkWidget *any_Label = GTK_WIDGET (gtk_label_new ("   |   "));
 
   //  https://docs.gtk.org/gtk4/class.Stack.html
-  GtkWidget *a_switcher = gtk_stack_switcher_new ();
-  GtkWidget *a_stack = gtk_stack_new ();
-  GtkStackPage* stack_child_space = gtk_stack_add_child (GTK_STACK (a_stack), GTK_WIDGET (get_STATE_VIEW_box()));
-  GtkStackPage* stack_child_rules = gtk_stack_add_child (GTK_STACK (a_stack), GTK_WIDGET (get_edit_rules_page_new()));
-  GtkStackPage* stack_child_data  = gtk_stack_add_child (GTK_STACK (a_stack), GTK_WIDGET (get_measures_page_new()));
+  GtkWidget *switcher_SRD = gtk_stack_switcher_new ();
+  GtkWidget *stack_SRD = gtk_stack_new ();
+  gtk_stack_switcher_set_stack (GTK_STACK_SWITCHER (switcher_SRD), GTK_STACK (stack_SRD));
 
-  gtk_stack_switcher_set_stack (GTK_STACK_SWITCHER (a_switcher), GTK_STACK (a_stack));
-  gtk_stack_add_titled (GTK_STACK (a_stack), GTK_WIDGET (get_STATE_VIEW_box()), "a_name", "space");
-  gtk_stack_add_titled (GTK_STACK (a_stack), GTK_WIDGET (get_edit_rules_page_new()), "another_name", "rules");
-  gtk_stack_add_titled (GTK_STACK (a_stack), GTK_WIDGET (get_measures_page_new()), "a_third_name", "data analysis");
+//  GtkStackPage* page_child_space = gtk_stack_add_child (GTK_STACK (stack_SRD), GTK_WIDGET (get_STATE_VIEW_box()));
+//  GtkStackPage* page_child_rules = gtk_stack_add_child (GTK_STACK (stack_SRD), GTK_WIDGET (get_edit_rules_page_new()));
+//  GtkStackPage* page_child_data  = gtk_stack_add_child (GTK_STACK (stack_SRD), GTK_WIDGET (get_measures_page_new()));
 
-//  gtk_stack_page_set_visible (*self, TRUE);
-//  gtk_window_set_child (main_window, GTK_WIDGET (gtk_stack_get_visible_child (GTK_STACK (a_stack))));
-  gtk_stack_set_visible_child (GTK_STACK (a_stack), GTK_WIDGET (get_STATE_VIEW_box()));
-  gtk_stack_set_visible_child (GTK_STACK (a_stack), GTK_WIDGET (get_edit_rules_page_new()));
-  gtk_widget_set_visible (GTK_WIDGET (get_edit_rules_page_new()), TRUE);
+  gtk_stack_add_titled (GTK_STACK (stack_SRD), GTK_WIDGET (get_STATE_VIEW_box()),      "name_space", "space");
+  gtk_stack_add_titled (GTK_STACK (stack_SRD), GTK_WIDGET (get_edit_rules_page_new()), "name_rules", "rules");
+  gtk_stack_add_titled (GTK_STACK (stack_SRD), GTK_WIDGET (get_measures_page_new()),   "name_data",  "data analysis");
+
+//  gtk_stack_page_set_visible (page_child_space, TRUE);
+//  gtk_widget_set_visible (GTK_WIDGET (page_child_rules), TRUE);
+//  gtk_stack_set_visible_child (GTK_STACK (stack_SRD), GTK_WIDGET (page_child_space));
+//  gtk_stack_set_visible_child (GTK_STACK (stack_SRD), GTK_WIDGET (page_child_rules));
 
   gtk_header_bar_pack_start (GTK_HEADER_BAR (header_bar), GTK_WIDGET (btt_XOR_EXEC_EDIT));
   gtk_header_bar_pack_start (GTK_HEADER_BAR (header_bar), GTK_WIDGET (any_Label));
-  gtk_header_bar_pack_start (GTK_HEADER_BAR (header_bar), GTK_WIDGET (a_switcher));
+  gtk_header_bar_pack_start (GTK_HEADER_BAR (header_bar), GTK_WIDGET (switcher_SRD));
+
+  gtk_window_set_child (main_window, GTK_WIDGET (get_STATE_VIEW_box()));
 }
 
 void window_main_child (GtkWindow *main_window, int selected_page){
@@ -366,8 +368,8 @@ void window_header_bar (GtkWindow *window, char *title){
 //  https://docs.gtk.org/gobject/tutorial.html#how-to-define-and-implement-a-new-gobject
 
   GtkWidget *a_stack = gtk_stack_new ();
-  GtkWidget *a_switcher = gtk_stack_switcher_new ();
-  gtk_stack_switcher_set_stack (GTK_STACK_SWITCHER (a_switcher), GTK_STACK (a_stack));
+  GtkWidget *switcher_SRD = gtk_stack_switcher_new ();
+  gtk_stack_switcher_set_stack (GTK_STACK_SWITCHER (switcher_SRD), GTK_STACK (a_stack));
   gtk_stack_add_titled (GTK_STACK (a_stack), GTK_WIDGET (page_box), "a_name", "space");
 //  gtk_stack_page_set_visible (*self, TRUE);
 
@@ -377,7 +379,7 @@ void window_header_bar (GtkWindow *window, char *title){
 //  gtk_header_bar_pack_start (GTK_HEADER_BAR (header_bar), GTK_WIDGET (btt_open_STATE));
 //  gtk_header_bar_pack_start (GTK_HEADER_BAR (header_bar), GTK_WIDGET (btt_open_RULES));
 //  gtk_header_bar_pack_start (GTK_HEADER_BAR (header_bar), GTK_WIDGET (btt_open_DATA));
-  gtk_header_bar_pack_start (GTK_HEADER_BAR (header_bar), GTK_WIDGET (a_switcher));
+  gtk_header_bar_pack_start (GTK_HEADER_BAR (header_bar), GTK_WIDGET (switcher_SRD));
 
 //  icons_for_fun (GTK_HEADER_BAR (header_bar));   //  https://iconduck.com/sets/adwaita-icon-theme
 }