diff --git a/src/window/app.py b/src/window/app.py
index f685a11..872e778 100644
--- a/src/window/app.py
+++ b/src/window/app.py
@@ -43,7 +43,7 @@ class App:
             self.button_frame.columnconfigure(i, weight=1)
             new_button.grid(row=0, column=i, sticky=W + E)
             i += 1
-            
+
         new_button = Button(self.button_frame, text="Custom", command=self.custom_session)
         self.buttons.append(new_button)
         self.button_frame.columnconfigure(i, weight=1)
@@ -58,8 +58,8 @@ class App:
 
     def custom_session(self):
         self.session_window = SessionWindow(self)
-        self.session_window.open(self)
-        
+        self.session_window.open()
+
     def select_folder(self):
         self.selected_folder = filedialog.askdirectory()
         self.found_images = list(
diff --git a/src/window/session.py b/src/window/session.py
index 1fb99d6..d10c026 100644
--- a/src/window/session.py
+++ b/src/window/session.py
@@ -1,8 +1,12 @@
+from functools import partial
 from tkinter import *
 
 
 class SessionWindow:
     def __init__(self, app):
+        self.selected_element_index = 0
+        self.delete_button = None
+        self.add_button = None
         self.app = app
 
         self.window = Toplevel(app.root)
@@ -10,16 +14,51 @@ class SessionWindow:
         self.window.geometry("600x600")
         self.window.protocol("WM_DELETE_WINDOW", self.save_on_closing)
 
+        self.left_column = Frame(self.window, width=300, height=600)
+        self.right_column = Frame(self.window, width=300, height=600)
+
+        self.left_column.grid(row=0, column=0, sticky="ns")
+        self.right_column.grid(row=0, column=1, sticky="ns")
+
         self.list_in_session = []
 
+    def open(self):
         self.update_session_list()
 
+        self.add_button = Button(self.left_column, text="+", command=self.add_element)
+        self.add_button.pack()
+
+        self.delete_button = Button(self.left_column, text="-", command=self.remove_element)
+        self.delete_button.pack()
 
     def update_session_list(self):
         for i, session in enumerate(self.list_in_session):
-            new_session = Button(text="")
+            new_session = Button(self.left_column, text="element " + str(i), command=partial(self.edit_element, i))
             new_session.grid(row=i, column=0)
 
+    def remove_element(self):
+        self.list_in_session.pop(self.selected_element_index)
+
+    def edit_element(self, i):
+        self.selected_element_index = i
+        element = self.list_in_session[self.selected_element_index]
+
+        number_of_drawings_label = Text(self.right_column)
+        number_of_drawings_label.insert(INSERT, "Nombre de dessins :")
+        number_of_drawings_label.pack()
+
+        number_of_drawings_input = Entry(self.right_column)
+        number_of_drawings_input.insert(INSERT, element.number_of_drawings)
+        number_of_drawings_input.pack()
+
+    def add_element(self):
+        number_of_drawings_label = Text(self.right_column)
+        number_of_drawings_label.insert(INSERT, "Nombre de dessins :")
+        number_of_drawings_label.pack()
+
+        number_of_drawings_input = Entry(self.right_column)
+        number_of_drawings_input.pack()
+
     def save_on_closing(self):
         # TODO save
         self.window.destroy()