diff --git a/hot.c b/hot.c
index fd2811f..84ddf9a 100644
--- a/hot.c
+++ b/hot.c
@@ -13,3 +13,13 @@
 //  GTK_ORIENTATION_VERTICAL       GTK_ORIENTATION_HORIZONTAL
 
 
+GtkBox *get_experimental_box_new(){
+  GtkBox *experimental_box = GTK_BOX(gtk_box_new (GTK_ORIENTATION_VERTICAL, 0));
+  gtk_box_append (experimental_box, GTK_WIDGET(gtk_separator_new (GTK_ORIENTATION_HORIZONTAL)));
+  gtk_box_append (experimental_box, GTK_WIDGET(gtk_label_new ("\n\n")));
+
+  gtk_box_append (experimental_box, gtk_expander_new ("hello !"));
+
+  return experimental_box;
+}
+
diff --git a/hot.h b/hot.h
index 9a6cce3..d34f2e3 100644
--- a/hot.h
+++ b/hot.h
@@ -13,4 +13,4 @@
 #include "contain.h"
 
 GtkWidget *get_run_rules_page_new();
-
+GtkBox *get_experimental_box_new();
diff --git a/hot.o b/hot.o
index a1a8098..9b8ef79 100644
Binary files a/hot.o and b/hot.o differ
diff --git a/myprogram b/myprogram
index d65bcce..0824568 100755
Binary files a/myprogram and b/myprogram differ
diff --git a/tree.c b/tree.c
index 8ebe8d4..fecfbc4 100644
--- a/tree.c
+++ b/tree.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <gtk-4.0/gtk/gtk.h>
 
+#include "hot.h"
 #include "warm.h"
 #include "cold.h"
 #include "display.h"
@@ -261,8 +262,10 @@ static void ui_create_tree (GtkWidget *target_widget)
 }
 
 GtkBox *get_rules_user_tree_new(){
-  GtkBox *tree_sketch = GTK_BOX(gtk_box_new (GTK_ORIENTATION_VERTICAL, 0));
-  ui_create_tree (GTK_WIDGET (tree_sketch));
-  return tree_sketch;
+  GtkBox *tree_sketch_box = GTK_BOX(gtk_box_new (GTK_ORIENTATION_VERTICAL, 0));
+  ui_create_tree (GTK_WIDGET (tree_sketch_box));
+
+  gtk_box_append (tree_sketch_box, GTK_WIDGET (get_experimental_box_new()));
+  return tree_sketch_box;
 }
 
diff --git a/tree.d b/tree.d
index 517df2c..a2c33ca 100644
--- a/tree.d
+++ b/tree.d
@@ -1,3 +1,3 @@
-tree.o: tree.c warm.h \
+tree.o: tree.c hot.h warm.h \
  /gnu/store/fkmpkdav2zmz1k72989bdgpdrfac7rz1-glib-2.78.0/include/glib-2.0/glib.h \
  cold.h display.h contain.h texts.h
diff --git a/tree.o b/tree.o
index 70527db..17d87c4 100644
Binary files a/tree.o and b/tree.o differ