public newEmployee()
        {
            InitializeComponent();

            // Edit Employee
            if (Application.Current.Properties["mit_edit_id"] != null)
            {
                int         mit_id;
                var         bool5 = Int32.TryParse(Application.Current.Properties["mit_edit_id"].ToString(), out mit_id);
                Mitarbeiter mit   = Bibliothek.Mitarbeiter_nach_ID(mit_id);
                this.mitName.Text       = mit.Name;
                this.mitVorname.Text    = mit.Vorname;
                this.mitAktiv.IsChecked = mit.IstAktiv;
                this.mitSubmit.Tag      = "edit";

                // Create hidden button to save employee id
                this.btnID.Tag = mit_id.ToString();

                // Edit window opened and loaded.. reset trigger property
                Application.Current.Properties["mit_edit_id"] = null;
            }
        }