title: using single value json into extjs combobox
body: <p>This is the json response I am getting. I checked with JSONLINT and it says valid, but if you notice it's only giving me value without the heading of the column... the column name is "States".</p>
  
  <pre><code> {"myTable":["VA","CA","CO","OK","PA","TX"]}
  </code></pre>
  
  <p>Would it be possible to use this Json to load in my combobox</p>
  
  <pre><code>items: [{
                      xtype: 'combo',
                      id: 'iccombo',
                      scope: this,
                      store: this.store,
                      mode: 'remote',
                      minChars: 0,
                      fieldLabel: 'Short State',
                      displayField: 'States',
                      valueField: 'States',
                      typeAhead: true,
                      name: 'States',
                      labelWidth: 125,
                      anchor: '95%'
                  },
  </code></pre>
  
  <p>this is my store</p>
  
  <pre><code>var store = Ext.create('Ext.data.Store', {
          autoLoad: true,
          id: 'OurData',
          scope: this,
          fields: [{ name: 'States' }],
          proxy: {
              type: 'ajax',
              url: 'GetState/getS',
              reader: {
                  type: 'json',
                  root: 'myTable'
                  idProperty: 'States'
              }
          }
      });
  </code></pre>