private void DeleteUser_Click(object sender, RoutedEventArgs e)
        {
            DeleteUserWindow deleteUserWindow = new DeleteUserWindow();

            deleteUserWindow.Owner = this;
            deleteUserWindow.Show();
        }
 /// <summary>
 /// Creates dialog window with user deleting interface
 /// </summary>
 private void Delete_Click(object sender, RoutedEventArgs e)
 {
     DeleteUserWindow deleteUserWindow = new DeleteUserWindow();
     deleteUserWindow.ShowDialog();
 }