title: Binding grid to form without viewmodel
body: <p>To binding between a grid and a form I use something like:</p>
  
  <pre><code>viewModel: {
      type: 'viewermodel'
  },
  
  items: [{
      xtype: 'grid',
      title: 'Grid: click on the grid rows',
      itemId:'myGridItemId',
      flex: 1.2,
      margin: '0 10 0 0',
      bind:{
          store:'{mystore}',
          selection:'{users}'
      },
      columns: [
          { text: 'Name',  dataIndex: 'name', flex:0.5 },
          { text: 'Email', dataIndex: 'email', flex: 1 },
          { text: 'Cars', dataIndex: 'cars', flex: 1 }
      ]
  },
  </code></pre>
  
  <p>FIDDLE: <a href="https://fiddle.sencha.com/#fiddle/1is6&amp;view/editor" rel="nofollow noreferrer">https://fiddle.sencha.com/#fiddle/1is6&amp;view/editor</a></p>
  
  <p>Problem: the store is not in a viewmodel but in the store's app folder <strong>(App.store.MyStore)</strong>.</p>
  
  <p>Is there any way, in this case, of binding selection: '{users}' from record grid to form fields? Something like:</p>
  
  <pre><code>store:'MyStore',
  bind:{    
      selection:'{users}'
  },
  </code></pre>