title: In dialog window scroll while dragging with jquery's Drag-n-Drop doesn't work
body: <p>Problem:
  when I'm dragging inside of dialog box(look link image), Afganistan is the country that i'm dragging to bottom, when drag reaches bottom of this dialog box it's not autoscrolling.</p>
  
  <p>code I wrote:</p>
  
  <pre><code>function popUpCountries(url, widthWin, heightWin, title) {
      $("#dialog").dialog('destroy').html('&lt;img style="vertical-align: middle;" src="/system/ext/jquery/progbar.gif" alt="[[Please wait ...]]" /&gt;Please wait ...');
      $("#dialog").dialog({
          width: widthWin,
          height: heightWin,
          title: title,
          position : "center"
      }).dialog('open');
  
      $.get(url, function(data) {
          $("#dialog").html(data);
      });
  </code></pre>
  
  <p>image : <a href="http://postimg.org/image/cgcr0j32f/" rel="nofollow">http://postimg.org/image/cgcr0j32f/</a>
  I'm using jqueryUI dialog, dialog box's css position:absolute.
  thanks for any help!</p>