title: jstree on jQuery dialog on vertical scroll bar gives X icon with text of all jstree data
body: <p>I have a jQuery dialog and on top of that there is jstree. When i do vertical scroll bar it shows text of all tree items with mouse icon. </p>
  
  <p>My jstree plugins does not have dnd and it is initialized like this:</p>
  
  <pre><code>plugins: ['themes', 'json_data', 'crrm', 'checkbox'],
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/BvEhs.png" alt="enter image description here"> </p>
  
  <p>After Dialog opens and when I click on scroll it shows red cross icon along with mouse with text of all options. This dialog is initialized like this:</p>
  
  <pre><code> modal = $('&lt;div&gt;&lt;/div&gt;').addClass(this.widgetBaseClass + '-modal').dialog({
              modal: true,
              width: 500,
              autoOpen: false,
              resizable: false,               
              position: 'center',
              buttons: [{
                  text: 'Save',
                  click: $.proxy(this._save, this)
              }, {
                  text: 'Cancel',
                  click: $.proxy(this._cancel, this)
              }],
              title: 'Select ' + this.options.label
          });
  </code></pre>
  
  <p>This is happening with (IE9, FF, Chrome) Any suggestions?</p>