title: QTreeWidgetItem data
body: <p>I have a following data:</p>
  
  <pre><code>1.0 2.0 3.1 4.1 5.2
  </code></pre>
  
  <p>Where Index.SubIndex
  But I want to show in <code>QTreeWidget</code> as following:<br>
  <strong>Index 1</strong><br>
  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Index 3<br>
  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Index 4<br>
  <strong>Index 2</strong><br>
  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Index 5<br></p>
  
  <p>But I did as following:</p>
  
  <pre><code>QTreeWidgetItem *child = new QTreeWidgetItem();
  child-&gt;setText("Index " + QString::number(index));
  </code></pre>
  
  <p>But I want to save hidden data, which I should to get when user selected any item of tree.
  How I can do this? Which signal/slot I can use for it? I mean I should get not "Index 1" or "Index 2" and etc, I should get 1,2,3,4,5,6 aand etc. And parse text is NOT solution.</p>