Both images should be contained inside an `hbox`, containing `Ext.Button` instances with their corresponding `icon` attributes set to the images.

Basically, it should look something like this (replace last label with this):

```js
{
  layout: 'hbox',
  items: [
    { 
      type: 'button',
      icon: '...'
    },
    { 
      type: 'button',
      icon: '...'
    }
  ] 
}
```

Check the documentation for attributes to modify height buttons, etc.