title: Ext JS: FormPanel not populating fields with JSON data
body: <p>I have a FormPanel with 3 fields and a JsonReader. Here's the setup:</p>
  
  <pre><code>  var goalPanel = new Ext.FormPanel({
          reader: new Ext.data.JsonReader({
              idProperty: 'id',          
              root: 'items',             
              fields: [
                  {name: 'referenceSales', type:'float'},
                  {name: 'increasePercentage', type: 'float'},
                  {name: 'salesGoal', type: 'float'}
              ]
          }), 
          labelAlign: 'top',
          frame:true,
          bodyStyle:'padding:5px 5px 0',
          items: [{
              layout:'column',
              items:[{
                  columnWidth:.33,
                  layout: 'form',
                  items: [{
                      fieldLabel: 'Reference Sales',
                      xtype: 'numberfield',
                      name: 'referenceSales',
                      readOnly: true,
                      disabled: true,
                      anchor:'95%'
                  }]
              },{
                  columnWidth:.33,
                  layout: 'form',
                  items: [{
                      fieldLabel: 'Increase %',
                      name: 'increasePercentage',
                      xtype: 'numberfield',
                      anchor:'95%',
                      decimalPrecision: 2,
  
                      }
              }]},{
                  columnWidth:.34,
                  layout: 'form',
                  items: [{
                      fieldLabel: 'Sales Goal',
                      name: 'salesGoal',
                      xtype: 'numberfield',                   
                      anchor:'95%',
                      decimalPrecision: '2',
  
                  }]
              }]
          }],
  
          buttons: [{
              text: 'Recalculate'
          }]
      });
  </code></pre>
  
  <p>Here's how I load the data:</p>
  
  <pre><code>goalPanel.getForm().load({url:'goal/getAnnualSalesGoal', method:'GET',params:myParams} );
  </code></pre>
  
  <p>Here's the JSON response, as seen in Firebug:</p>
  
  <pre><code>{"items":[{"referenceSales":700000,"salesGoal":749000,"increasePercentage":0.07}]}
  </code></pre>
  
  <p>I get no errors, and after load the form fields are definitely empty. How can I fix this, or begin to debug it?</p>