This phenomenon means that when the calendar is displayed from the icon of the “Date Picker” control on the execution screen of the application, the page is reloaded when the cursor key such as [↑] or [↓] on the keyboard is pressed. This problem is not displayed on the preview screen of the app editing screen, but is reproduced only on the app execution screen. The browser has confirmed similar issues in IE / Edge / Chrome / FireFox. Can this problem be avoided? Or is it a bug because it is not reproduced in [App Preview] on the app editing screen?