title: limit field.Spinner data
body: <p>Spinner and Store (store have field: 'price')</p>
  
  <pre><code>Ext.define('TPL.store.Price', {
      fields: [
      {name: 'price', type: 'string'},
  
  ],
  proxy: {
  type: 'ajax',
  url: '/author/price"',
  reader: {
          type: 'json',
          root: 'data',
          successProperty: 'success'
  }}});
  </code></pre>
  
  <p>and i am want in my field.Spinner  show only data from  store 'Price'. I have two function onSpinUp and onSpinDown that functions must +1 or -1  Price, but no more and no less than than have Store 'Price'</p>
  
  <pre><code> spinner = Ext.create('Ext.form.field.Spinner', {
              step: 1,
              width: 100,
              height: 10
                onSpinUp: function() { }
                onSpinDown: function() { };
  </code></pre>
  
  <p>Thanks</p>