title: jQueryUI tabs with function in "show" option always show default effect
body: <p>When I include a function in "show" option in jQueryUI 1.9.1 tabs widget, default effect (fadeIn) always activates. Is there a way to have a function called on show, but without the effect?</p>
  
  <pre><code>$("#divTabContainer").tabs({
      "show": function(){
          var table = $.fn.dataTable.fnTables(false);
          if ( table.length &gt; 0 ) {
              console.log(table);
              $(table).dataTable().fnAdjustColumnSizing();
          }
      }
  });
  </code></pre>
  
  <p>I've tried to return false or null from the function, but it didn't have any influence, the effect was still there. In jQUI 1.8.1 this didn't happen, i.e. the function was called without the effect.</p>