diff --git a/callback.c b/callback.c
index 3128135..c4d36e2 100644
--- a/callback.c
+++ b/callback.c
@@ -219,21 +219,20 @@ void on_open_DATA  (GtkWidget *btt_open_DATA,  gpointer data) {
 
 void on_toggle_STATE_RULES_DATA (GtkWidget *btt, gpointer user_data) {
   //  https://docs.gtk.org/gtk4/class.ToggleButton.html  <  f..k !   bad code ++
-  // g_print ("Toggle button [%s] is active: %s\n", gtk_button_get_label (GTK_BUTTON (source)), gtk_toggle_button_get_active (source) ? "Yes" : "No");
 
-  char *source = "";
-  if (0) printf("gtk_check_button_get_active >           %d, %d, %d   < from callback : on_toggle_STATE_RULES_DATA()\n",\
-        gtk_check_button_get_active (GTK_CHECK_BUTTON (get_GtkButton (source))),
-        gtk_check_button_get_active (GTK_CHECK_BUTTON (get_GtkButton (source))),
-        gtk_check_button_get_active (GTK_CHECK_BUTTON (get_GtkButton (source))));
+  const char *btt_name = gtk_check_button_get_label (GTK_CHECK_BUTTON (btt));
+  int is_active = gtk_check_button_get_active (GTK_CHECK_BUTTON (btt));
 
+  int is_state_active = ! strcmp (btt_name, "state");
+  int is_rules_active = ! strcmp (btt_name, "rules");
+  int is_data_active  = ! strcmp (btt_name, "data analysis");
+  if (0 && is_active) printf (">  [%d]     %d, %d, %d    %14s\n",
+          is_active, is_state_active, is_rules_active, is_data_active, btt_name);
 
-  int choice = 0;
-  switch (choice) {
-  case (STATE): get_GtkButton ("state"); break;  //  get_window_child_STATE ();
-  case (RULES): get_GtkButton ("rules"); break;  //  get_window_child_RULES (); break;
-  case (DATA):  get_GtkButton ("data analysis"); break;  //  get_window_child_DATA ();  break;
-  default :     get_GtkButton ("state"); break;  //  get_window_child_STATE ();
+  if (is_active) {
+         if (is_state_active) gtk_window_set_child (main_window, GTK_WIDGET (get_window_child_STATE()));
+    else if (is_rules_active) gtk_window_set_child (main_window, GTK_WIDGET (get_window_child_RULES()));
+    else if (is_data_active)  gtk_window_set_child (main_window, GTK_WIDGET (get_window_child_DATA()));
   }
 }
 
diff --git a/contain.c b/contain.c
index 7f41663..e0cf41a 100644
--- a/contain.c
+++ b/contain.c
@@ -197,17 +197,17 @@ void window_header_bar (GtkWindow *window, char *title){
   GtkCheckButton *group_STATE_RULES_DATA = GTK_CHECK_BUTTON (gtk_check_button_new ());
 
   btt_open_STATE = GTK_BUTTON (gtk_check_button_new_with_label ("state"));
-  g_signal_connect (btt_open_STATE, "toggled", G_CALLBACK (on_open_STATE), no_local_data);
+//  g_signal_connect (btt_open_STATE, "toggled", G_CALLBACK (on_open_STATE), no_local_data);
   g_signal_connect (btt_open_STATE, "toggled", G_CALLBACK (on_toggle_STATE_RULES_DATA), no_local_data);
   gtk_check_button_set_group (GTK_CHECK_BUTTON (btt_open_STATE), group_STATE_RULES_DATA);
 
   btt_open_RULES = GTK_BUTTON (gtk_check_button_new_with_label ("rules"));
-  g_signal_connect (btt_open_RULES, "toggled", G_CALLBACK (on_open_RULES), no_local_data);
+//  g_signal_connect (btt_open_RULES, "toggled", G_CALLBACK (on_open_RULES), no_local_data);
   g_signal_connect (btt_open_RULES, "toggled", G_CALLBACK (on_toggle_STATE_RULES_DATA), no_local_data);
   gtk_check_button_set_group (GTK_CHECK_BUTTON (btt_open_RULES), group_STATE_RULES_DATA);
 
   btt_open_DATA  = GTK_BUTTON (gtk_check_button_new_with_label ("data analysis"));
-  g_signal_connect (btt_open_DATA,  "toggled", G_CALLBACK (on_open_DATA),  no_local_data);
+//  g_signal_connect (btt_open_DATA,  "toggled", G_CALLBACK (on_open_DATA),  no_local_data);
   g_signal_connect (btt_open_DATA,  "toggled", G_CALLBACK (on_toggle_STATE_RULES_DATA), no_local_data);
   gtk_check_button_set_group (GTK_CHECK_BUTTON (btt_open_DATA), group_STATE_RULES_DATA);
 
@@ -217,7 +217,7 @@ void window_header_bar (GtkWindow *window, char *title){
           gtk_check_button_get_label (GTK_CHECK_BUTTON (btt_open_RULES)),
           gtk_check_button_get_label (GTK_CHECK_BUTTON (btt_open_DATA)));
 
-  if (1) printf("gtk_check_button_get_active >  before = %d, %d, %d\n",\
+  if (0) printf("gtk_check_button_get_active >  before = %d, %d, %d\n",\
           gtk_check_button_get_active (GTK_CHECK_BUTTON (get_GtkButton ("state"))),
           gtk_check_button_get_active (GTK_CHECK_BUTTON (get_GtkButton ("rules"))),
           gtk_check_button_get_active (GTK_CHECK_BUTTON (get_GtkButton ("data analysis"))));