private void ChangePassword()
 {
     if (SelectedItem != null)
     {
         PasswordEditDialog dlg = new PasswordEditDialog(SelectedItem, false);
         dlg.ShowDialog();
     }
 }
        protected override SystemUser GetNewItemInstance()
        {
            var newU = new SystemUser
            {
                UserName   = "******",
                Creator    = ModelSource.CurrentUser.UserName,
                CreateTime = DateTime.Now.ToString(),
                IsActive   = true
            };
            PasswordEditDialog dlg = new PasswordEditDialog(newU, true);

            dlg.ShowDialog();
            var pwd = dlg.newPwdBox.Password;

            return(string.IsNullOrWhiteSpace(pwd) ? null : newU);
        }