private void btnCustomerLogin_Click(object sender, RoutedEventArgs e)
        {
            bool success = LoginRegisterViewModel
                           .LoginCustomer
                               (tbCustomerEmailLogin.Text, tbCustomerPasswordLogin.Password);

            if (success && Session.isLogin)
            {
                this.Hide();
                if (Session.role.ToUpper() == "ADMIN")
                {
                    HomeAdminView hav = new HomeAdminView();
                    hav.ShowDialog();
                }
                else
                {
                    CustomerView cv = new CustomerView();
                    cv.ShowDialog();
                }
                Utility.TraverseVisualTree(this);
                this.Show();
            }
        }
        //Button Seller Login
        private void btnSellerLogin_Click(object sender, RoutedEventArgs e)
        {
            bool success = LoginRegisterViewModel
                           .LoginSeller
                               (tbSellerEmailLogin.Text, tbSellerPasswordLogin.Password);

            if (success && Session.isLogin)
            {
                this.Hide();
                if (Session.role.ToUpper() == "ADMIN")
                {
                    HomeAdminView hav = new HomeAdminView();
                    hav.ShowDialog();
                }
                else
                {
                    //Seller View (Diganti kalau sudah ada View)
                    SellerView sv = new SellerView();
                    sv.ShowDialog();
                }
                this.Show();
                Utility.TraverseVisualTree(this);
            }
        }