private void button_End_Tab1_Click(object sender, RoutedEventArgs e)
        {
            if (Validate())
            {
                UserRole selectedRole;
                switch ((string)roleComboBox.SelectedValue)
                {
                case "Client":
                    selectedRole = UserRole.Client;
                    break;

                case "Admin":
                    selectedRole = UserRole.Admin;
                    break;

                case "Operator":
                    selectedRole = UserRole.Operator;
                    break;

                case "Security Service Employee":
                    selectedRole = UserRole.SecurityServiceEmployee;
                    break;

                default:
                    selectedRole = UserRole.Client;
                    break;
                }
                //register user if it's not a client
                _userBusinessComponent.Add(textBox_Create_Login.Text,
                                           passwordBox_Create_Password.Password,
                                           selectedRole);
                MessageBox.Show("Registered successfully!");
            }
        }