title: Unable to close modal dialog
body: <p>I'm trying to call a screen as a popup. The screen type is set to <code>Modal dialog box</code> and I'm able to call the screen, but unable to close it. Nothing happens when I click on the little cross. The next screen is set to <code>0</code>.</p>
  <p>The screen I'm calling as a popup, doesn't contain any buttons, not any hard coded ones anyway. Any ideas what I'm doing wrong?</p>
  <p>I'd also like the screen it returns to, to be refreshed (so it loads the PBO again). How do I do that?</p>
  <p>Here is the code:</p>
  <pre><code>MODULE werkende_knoppen_subscreen INPUT.
    CASE ok_code.
      WHEN 'X'.
        LEAVE TO SCREEN 0.
    ENDCASE.
  ENDMODULE.
  </code></pre>