title: Dynatree, parent node unchecked even all childs are checked
body: <p>I am using <a href="http://www.jqueryrain.com/?SFoGTfLr" rel="nofollow">Dynatree</a> (Ver: 1.2.7) for creation of a hierarchical multi-selection. The <strong>checkboxes and selectMode 3</strong> option given in its site.</p>
  
  <p>I have a parent child structure as below:</p>
  
  <pre><code>var treeData = [
  {title: "TST", key: "TST" }, 
  {title: "A1", key: "a1",expand: true,
    children: [
         {title: "A2", key: "a2" ,expand: true ,
         children: [
                {title: "A3", key: "a3" }
              ]
         }     
       ]
     },   
  ];
  </code></pre>
  
  <p>Basically: </p>
  
  <pre><code>A1
   |
   A2
    |
    A3
  </code></pre>
  
  <p>Now what i needed was that if i select <strong>A1</strong> all childs under it should get selected (i.e. checkboxes checked). This works fine. </p>
  
  <p>But if i select on <strong>A3</strong> only <strong>A3</strong> should get selected. 
  Here as <strong>A3</strong> is the only child of <strong>A2</strong>, and <strong>A2</strong> the only child of <strong>A1</strong>, so when i select <strong>A3</strong> all of them are getting selected. i.e even <strong>A2</strong> and <strong>A1</strong> are getting selected.</p>
  
  <p>I understand that its a hierarchical structure so if i select all childs of a parent the parent itself gets selected. </p>
  
  <p>But is there a parameter which changes thing the way am looking for?  </p>