title: sencha touch search form
body: <p>I really hope someone can help me, It seems like this should be obvious but sencha documentation isn't very easy to read and incomplete. I am trying to build a search form but it doesnt seem to take the store or the url and I can't figure out how to add parameters like page? Can anyone help? This code just produces Failed to load resource: null.</p>
  
  <pre><code>        var searchField = new Ext.form.Search({
              value:'Search',
              url: 'someurl',
              store: this.data_store,
              cls:'searchfield',
              listeners: {
                  focus: function(){ searchField.setValue(''); },
                  blur: function(){ if( searchField.getValue()=='' ){ searchField.setValue('Search'); } },
                  success: function(e){
                      console.log(e);
                  }
              }
          });
  
     this.dockedItems = [ searchField ];
  </code></pre>