title: How to display correctly Treeview with QML Qt 5.5
body: <p>I'm trying to create a correct Treeview with Qml Qt 5.5.
  I succeed to have a Treeview with a global root. 
  But impossible to find how to add child for row item.</p>
  
  <p>For the moment I got something like that :</p>
  
  <pre><code>    TreeView {
          id:listTree
          anchors.fill: parent
          anchors.leftMargin: 1
          headerVisible: false
          backgroundVisible: false
  
          selection: ItemSelectionModel {
              model: myModel
          }
          TableViewColumn {
              role: "name"
          }
  
          itemDelegate: Item {
              Text {
                  anchors.verticalCenter: parent.verticalCenter
                  color: styleData.textColor
                  elide: styleData.elideMode
                  text: styleData.value
              }
          }
  
          Component.onCompleted: {
              model.append({"name":"Never"})
              model.append({"name":"gonna"})
              model.append({"name":"give"})
              model.append({"name":"you"})
              model.append({"name":"up"})
              model.append({"name":"Never"})
              model.append({"name":"gonna"})
              model.append({"name":"let"})
              model.append({"name":"you"})
              model.append({"name":"dow"})
          }
      }
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/mfTc4.png" rel="noreferrer"><img src="https://i.stack.imgur.com/mfTc4.png" alt="enter image description here"></a></p>
  
  <p>And I would like something like that :</p>
  
  <p><a href="https://i.stack.imgur.com/eCz4W.png" rel="noreferrer"><img src="https://i.stack.imgur.com/eCz4W.png" alt="enter image description here"></a></p>
  
  <p>How can I do it ?</p>