public void EcranCreerCompte()
        {
            grdMain.Children.Remove(ContenuEcran);
            grdMain.Children.Remove(ContenuListeAmi);
            ContenuEcran = new CreationCompte(this);


            grdMain.Children.Add(ContenuEcran);
        }
        public void OnAddUserCommand(object obj)
        {
            ButtonPressedEvent.GetEvent().Handler += CloseAddUserView;

            _fenetreAjoutUser = new CreationCompte();
            _fenetreAjoutUser.ShowDialog();

            if (_fenetreAjoutUser.ViewModel.IsSaisieValid)
            {
                ListeUsers.Add(_fenetreAjoutUser.ViewModel.User);
            }
        }