title: GWT Tree Item:How to add image to tree item?
body: <p>I am using gwt 2.3 version.I am using gwt tree in my application.
  Here is my code:</p>
  
  <pre><code>  public void onModuleLoad() {
  // Create a tree with a few items in it.
  TreeItem root = new TreeItem("root");
  root.addItem("item0");
  root.addItem("item1");
  root.addItem("item2");
  
  // Add a CheckBox to the tree
  TreeItem item = new TreeItem(new CheckBox("item3"));
  root.addItem(item);
  
  Tree t = new Tree();
  t.addItem(root);
  
  // Add it to the root panel.
  RootPanel.get().add(t);
  </code></pre>
  
  <p>}</p>
  
  <p>There is a item with check box.I want add image to this tree item.But I am not able to do this as I already added one widget check box.Is there any other way add image to tree item with check box??</p>