title: How to change label background color dynamically?
body: <p>For instance, there is a label (without textfield!):  </p>
  
  <pre><code>Ext.create('Ext.form.Label', {
     id: "lb1",
     height: 20,
     html: "Title"
     cls: 'cls1'
  })
  </code></pre>
  
  <p>How can I change the background color dynamically without a CSS?</p>