title: Set text field in screen visible again after user command
body: <p>in my PBO Module I have something like this:</p>
  <pre><code>  LOOP AT SCREEN.
      IF screen-name EQ 'LBL_TEST'.
        screen-invisible = '1'.
        MODIFY SCREEN.
      ENDIF.
    ENDLOOP.
  </code></pre>
  <p>I want to set 'LBL_TEST' visible again after some User-Command in the PAI-Module. How can I do it?</p>
  <p>Best regards,
  Timur</p>