diff --git a/contain.c b/contain.c
index 9f8053b..0dedbc4 100644
--- a/contain.c
+++ b/contain.c
@@ -168,28 +168,31 @@ void window_header_bar (GtkWindow *main_window, char *title){
   GtkWidget *header_bar = GTK_WIDGET (gtk_header_bar_new ());
   gtk_header_bar_set_title_widget (GTK_HEADER_BAR (header_bar), gtk_label_new (title));
   gtk_window_set_titlebar (main_window, header_bar);
-  gpointer no_local_data = NULL;
 
   GtkButton *btt_XOR_EXEC_EDIT = GTK_BUTTON (gtk_toggle_button_new ());
   gtk_button_set_icon_name (btt_XOR_EXEC_EDIT, "system-run-symbolic");
   gtk_button_set_icon_name (btt_XOR_EXEC_EDIT, "power-profile-performance-symbolic");
-  g_signal_connect (btt_XOR_EXEC_EDIT, "clicked", G_CALLBACK (on_toggle_EXEC_EDIT), no_local_data);
+  g_signal_connect (btt_XOR_EXEC_EDIT, "clicked", G_CALLBACK (on_toggle_EXEC_EDIT), NULL);
 
   GtkWidget *any_Label = GTK_WIDGET (gtk_label_new ("   |   "));
 
   //  https://docs.gtk.org/gtk4/class.Stack.html
-  GtkWidget *a_stack = gtk_stack_new ();
   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()));
+
   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");
 
 //  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_window_set_child (main_window, GTK_WIDGET (gtk_stack_get_visible_child (GTK_STACK (a_stack))));
+  gtk_widget_set_visible (GTK_WIDGET (get_edit_rules_page_new()), TRUE);
 
   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));