diff --git a/callback.c b/callback.c
index a10dda6..243ac7b 100644
--- a/callback.c
+++ b/callback.c
@@ -167,7 +167,6 @@ void on_axis_value_change(GtkAdjustment *adjustment, gpointer data)
 /*                             B U T T O N S                                  */
 /******************************************************************************/
 void on_toggle_model_exec (GtkWidget *btt_run_stop_model_exec, gpointer data) {}
-void on_toggle_observ_interpret (GtkWidget *btt_toggle_observ_interpret, gpointer data) {}
 void on_toggle_exec_edit (GtkWidget *btt_exec_xor_edit, GtkWidget *btt_run_stop_model_exec) {
 //    gtk_button_set_icon_name (GTK_BUTTON (btt_exec_xor_edit), "power-profile-balanced-rtl-symbolic");
 //    gtk_button_set_label (GTK_BUTTON (btt_run_stop_model_exec), " run ");
diff --git a/contain.c b/contain.c
index be3dfc1..2d6515b 100644
--- a/contain.c
+++ b/contain.c
@@ -177,14 +177,21 @@ void window_header_bar (GtkWindow *window, char *title){
   GtkButton *run_stop_model_exec = GTK_BUTTON (gtk_button_new_with_label (" run "));
   g_signal_connect (run_stop_model_exec, "clicked", G_CALLBACK (on_toggle_model_exec), no_local_data);
 
-  GtkButton *btt_open_STATE = GTK_BUTTON (gtk_button_new_with_label ("state"));
-  g_signal_connect (btt_open_STATE, "clicked", G_CALLBACK (on_open_STATE), no_local_data);
+  GtkCheckButton *group_STATE_RULES_DATA = GTK_CHECK_BUTTON (gtk_check_button_new ());
 
-  GtkButton *btt_open_RULES = GTK_BUTTON (gtk_button_new_with_label ("rules"));
-  g_signal_connect (btt_open_RULES, "clicked", G_CALLBACK (on_open_RULES), no_local_data);
+  GtkButton *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);
+  gtk_check_button_set_group (GTK_CHECK_BUTTON (btt_open_STATE), group_STATE_RULES_DATA);
 
-  GtkButton *btt_open_DATA  = GTK_BUTTON (gtk_button_new_with_label ("data analysis"));
-  g_signal_connect (btt_open_DATA,  "clicked", G_CALLBACK (on_open_DATA),  no_local_data);
+  GtkButton *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);
+  gtk_check_button_set_group (GTK_CHECK_BUTTON (btt_open_RULES), group_STATE_RULES_DATA);
+
+  GtkButton *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);
+  gtk_check_button_set_group (GTK_CHECK_BUTTON (btt_open_DATA), group_STATE_RULES_DATA);
+
+  gtk_check_button_set_active (GTK_CHECK_BUTTON (btt_open_STATE), TRUE);
 
   gtk_header_bar_pack_start (GTK_HEADER_BAR (header_bar), GTK_WIDGET (exec_xor_edit));
   gtk_header_bar_pack_start (GTK_HEADER_BAR (header_bar), GTK_WIDGET (run_stop_model_exec));