title: Infinite scrolling on extJS local data store
body: <p>is it possible to have infinte scrolling in a extJS (4.1) grid, whose data-store is loaded manually? </p>
  
  <pre><code>myStore = Ext.create('Ext.data.Store', {
      fields:givenStoreFields,
      data: [[]],
  });
  
  myGrid = Ext.create('Ext.grid.Panel', {
      store: myStore,
      columns: givenColumns,
  });
  </code></pre>
  
  <p>In my case I fetch data from the server, the data is tweaked, and then loaded into the store manually.</p>
  
  <pre><code>myStore.loadData(fetchedAndTweaked);
  </code></pre>
  
  <p>Since fetchedAndTweaked contains many rows, rendering is very slow, and slows the entire browser. Therefore I want to add parameters to myGryd and myStore to have "infinite" scrolling (on the data-set fetchedAndTweaked).</p>
  
  <p><strong>However</strong>: All examples I find, the dataStore has some proxy/reader etc. </p>
  
  <p>//Thanks</p>