private void OnLostFocus()
        {
            if (!EditText.Validate())
            {
                EditTextBox.Focus(FocusState.Keyboard);
                return;
            }

            EditText.CompleteEdit();
        }
 private void OnKeyDown(KeyRoutedEventArgs e)
 {
     if (e.Key == VirtualKey.Escape)
     {
         EditText.CancelEdit();
     }
     else if (e.Key == VirtualKey.Enter && !EditText.IsMultiLine.Value && EditText.Validate())
     {
         EditText.CompleteEdit();
     }
 }