diff -r 42cf4dbc473b -r dd8ed4d3beb6 src/FingersDance/MainSurfaceWindow.xaml.cs
--- a/src/FingersDance/MainSurfaceWindow.xaml.cs	Wed Oct 14 14:29:23 2009 +0200
+++ b/src/FingersDance/MainSurfaceWindow.xaml.cs	Wed Oct 14 13:44:25 2009 +0200
@@ -18,6 +18,8 @@
 using FingersDance.Control.UserPanel;
 using FingersDance.Control.Screen;
 using FingersDance.Control.Close;
+using FingersDance.ViewModels;
+using FingersDance.Data;
 
 
 namespace FingersDance
@@ -32,14 +34,18 @@
         /// </summary>
         /// 
         #region Variables
+
         private UserControlUserPanel Panel1 = null;
         private UserControlUserPanel Panel2 = null;
         private UserControlUserPanel Panel3 = null;
         private UserControlUserPanel Panel4 = null;
+        ActionFactory.ActionGenerator _Factory = new FingersDance.ActionFactory.ActionFactory().GetGenerator();
+        private MainViewModel _mainviewmodel = new MainViewModel();      
+
         #endregion
 
-        ActionFactory.ActionGenerator _Factory = new FingersDance.ActionFactory.ActionFactory().GetGenerator();
 
+        #region Constructor
         public SurfaceWindow1()
         {
             InitializeComponent();
@@ -51,6 +57,9 @@
             // Add handlers for Application activation events
             AddActivationHandlers();
         }
+        #endregion
+
+        #region Initialization
 
         private void InitPivotInertia()
         {
@@ -83,6 +92,7 @@
             catch (Exception ex) { }
         }
 
+        #endregion
 
         /// <summary>
         /// Occurs when the window is about to close. 
@@ -253,13 +263,18 @@
 
         private void UserControlPivot_EH_SurfaceButtonPlayer_ContactDown(object sender, EventArgs e)
         {
+            //  Si aucune video n'a été sélectionnée et qu'une grid contient un élément (listvideo), on ne fait rien
+            if (_mainviewmodel.Session.VideoPath.Equals("") && (Grid1.Children.Count == 2 || Grid2.Children.Count == 2 || Grid3.Children.Count == 2 || Grid4.Children.Count == 2))
+                return;
+
+            //  Traitement du contact down sur le pivot (Création d'un screen ou suppression d'un panel
             switch ((int)sender)
             {
                 case 1:
                     if (Panel1 == null && Grid1.Children.Count == 1)
                     {
                         //1-Creation du control Screen
-                        UserControlScreen Screen = new UserControlScreen(1);
+                        UserControlScreen Screen = new UserControlScreen(1, _mainviewmodel);
                         Screen.Name = "Screen1";
                         Screen.contexteGrid = Grid1.Name.ToString();
                         //2-Rajout du screen dans la grid correspondante
@@ -282,7 +297,7 @@
                     if (Panel2 == null && Grid2.Children.Count == 1)
                     {
                         //1-Creation du control Screen
-                        UserControlScreen Screen = new UserControlScreen(2);
+                        UserControlScreen Screen = new UserControlScreen(2, _mainviewmodel);
                         Screen.Name = "Screen2";
                         Screen.contexteGrid = Grid2.Name.ToString();
                         //2-Rajout du screen dans la grid correspondante
@@ -305,7 +320,7 @@
                     if (Panel3 == null && Grid3.Children.Count == 1)
                     {
                         //1-Creation du control Screen
-                        UserControlScreen Screen = new UserControlScreen(3);
+                        UserControlScreen Screen = new UserControlScreen(3, _mainviewmodel);
                         Screen.Name = "Screen3";
                         Screen.contexteGrid = Grid3.Name.ToString();
                         //2-Rajout du screen dans la grid correspondante
@@ -328,7 +343,7 @@
                     if (Panel4 == null && Grid4.Children.Count == 1)
                     {
                         //1-Creation du control Screen
-                        UserControlScreen Screen = new UserControlScreen(4);
+                        UserControlScreen Screen = new UserControlScreen(4, _mainviewmodel);
                         Screen.Name = "Screen4";
                         Screen.contexteGrid = Grid4.Name.ToString();
                         //2-Rajout du screen dans la grid correspondante
@@ -360,28 +375,33 @@
                 Grid root = (Grid)(((UserControlScreen)sender).Parent);
                 root.Children.Remove(((UserControlScreen)sender));
                 //2-Creation du User Panel
+                Project newProject = _mainviewmodel.CreateProject(((UserControlScreen)sender).User);
+
+                if ((Panel1 != null && Panel1.Project.Equals(newProject)) || (Panel2 != null && Panel2.Project.Equals(newProject)) || (Panel3 != null && Panel3.Project.Equals(newProject)) || (Panel4 != null && Panel4.Project.Equals(newProject)))
+                    return;
+
                 switch (((UserControlScreen)sender).id)
                 {
                     case 1:
-                        Panel1 = new UserControlUserPanel(((UserControlScreen)sender).Path);
+                        Panel1 = new UserControlUserPanel(newProject, _mainviewmodel.Session.VideoPath);
                         Panel1.Name = "UserPanel1";
                         //3-Rajout sur la Grid Root
                         root.Children.Add(Panel1);
                         break;
                     case 2:
-                        Panel2 = new UserControlUserPanel(((UserControlScreen)sender).Path);
+                        Panel2 = new UserControlUserPanel(newProject, _mainviewmodel.Session.VideoPath);
                         Panel2.Name = "UserPanel2";
                         //3-Rajout sur la Grid Root
                         root.Children.Add(Panel2);
                         break;
                     case 3:
-                        Panel3 = new UserControlUserPanel(((UserControlScreen)sender).Path);
+                        Panel3 = new UserControlUserPanel(newProject, _mainviewmodel.Session.VideoPath);
                         Panel3.Name = "UserPanel3";
                         //3-Rajout sur la Grid Root
                         root.Children.Add(Panel3);
                         break;
                     case 4:
-                        Panel4 = new UserControlUserPanel(((UserControlScreen)sender).Path);
+                        Panel4 = new UserControlUserPanel(newProject, _mainviewmodel.Session.VideoPath);
                         Panel4.Name = "UserPanel4";
                         //3-Rajout sur la Grid Root
                         root.Children.Add(Panel4);