public WindowPrincipale()
{
InitializeComponent();
Filieres usercontrol = new Filieres();
Principale.Children.Add(usercontrol);
}
private void FieldManagmentButton_Click(object sender, RoutedEventArgs e)
{
Principale.Children.Clear();
Filieres usercontrol = new Filieres();
Principale.Children.Add(usercontrol);
Storyboard s = (Storyboard)TryFindResource("CloseMenu");
s.Begin();
ButtonClose.Visibility = Visibility.Collapsed;
ButtonClose2.Visibility = Visibility.Visible;
ButtonOpenMenu.Visibility = Visibility.Visible;
ButtonCloseMenu.Visibility = Visibility.Collapsed;
}