title: ExtJS 6 -- get store inside viewmodel
body: <p>I have an ExtJS 6.5.1 app and I am just now starting to migrate our app from MVC to MVVM, so I am pretty clueless about VM and VC.</p>
  
  <p>I have a viewModel with an inline store like so:</p>
  
  <pre><code>Ext.define("MYAPP.view.ViewportViewModel",{
       extend:"Ext.app.ViewModel",
  
       alias: 'viewmodel.viewport',
  
       constructor: function(config) {
          var me = this;
  
          this.callParent(arguments);
  
          me.setStores({
              info: {
                  autoLoad:true,
                  fields:["TEST"],
                  proxy:{
                      type:"ajax",
                      url:"blah.html",
                      reader:{
                           type:"json"
                      }
                  }
              }
          });
       }
  });
  </code></pre>
  
  <p>From inside my controller, how can I "get" the store so I can change the URL, reload, pass extraParams etc?</p>
  
  <p>Thanks</p>