title: Extjs 4 MVC Declare a variable to use in a whole controller
body: <p>In my controller I want to use certain variables in several places.</p>
  
  <p>For example I got a form with few fields (combo / textfield) and I want to use a link to them in a various places of my controller code. How can / should I declare such variable?
  Usually I use:</p>
  
  <pre><code>refs: [
      {
          ref: 'myCombo',
          selector: 'myPanel combo[name=myCombo]'
      },
      {
          ref: 'myTextfield',
          selector: 'myPanel textfield[name=myTextfield]'
      }
  ]
  </code></pre>
  
  <p>But is it ok to use getMyCombo() / getMyTextfield() every time I have to work with this fields in my controller?</p>