title: GWT StoreFilterField - auto filter
body: <p>I would like to filter a tree without type in the textfield, but when an event is triggered.
  I tried subclassing StoreFilterField like this:</p>
  
  <pre><code>class MyStoreFilter&lt;M extends ModelData&gt; extends StoreFilterField&lt;M&gt;{
  public MyStoreFilter() {
              super();
          }
  
          public void startFilter(){
              super.onFilter();
          }
  
  
          @Override
          protected boolean doSelect(Store&lt;M&gt; store, M parent, M record,
                  String property, String filter) {
              String name = record.get("name");
              name = name.toLowerCase();
              if (name.startsWith(filter.toLowerCase())) 
                  return true;
              else
                  return false;
          }
  
      };
  </code></pre>
  
  <p>And when i want to filter my tree:</p>
  
  <pre><code>MyStoreFilter&lt;ModelData&gt; f=new MyStoreFilter&lt;ModelData&gt;();
  f.setRawValue(myText);
  f.bind(store);
  f.startFilter();
  </code></pre>
  
  <p>But doesn't work, and my filter shows all items of my tree.
  What is wrong?</p>