public async void Execute(object parameter)
        {
            User user = parameter as User;

            if (user != null)
            {
                if (String.IsNullOrWhiteSpace(user.Username) || String.IsNullOrWhiteSpace(user.Password))
                {
                    MessageBox.Show("Please provide username and password");
                    return;
                }
                this.basePage.IsBusy = true;
                var operationStatus = await App.LoginService.LoginUser(user.Username, user.Password);

                this.basePage.IsBusy = false;

                if ((bool)operationStatus)
                {
                    PageRouter.Navigate(Page.EntriesList);
                }
                else
                {
                    MessageBox.Show(operationStatus.StatusDescription);
                }
            }
            else
            {
                MessageBox.Show("Internal error occured");
            }
        }
 public void Execute(object parameter)
 {
     PageRouter.Navigate(Page.CreateAccount);
 }