JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://docs.sencha.com/extjs/4.1.3/resources/css/app-b35792cfe6686887f720936b33191682.css">
<html>
<body>
    <p>what the fack</p>
</body>
</html>

JavaScript

var StaticComboBox = Ext.extend(Ext.form.ComboBox, {
  mode: 'local',
  triggerAction: 'all',
  editable: false,
  valueField: 'value',
  displayField: 'label', 
  data: [], 
  initComponent: function() {
    this.store = new Ext.data.Store({
      fields: ['value', 'label'],
      data: this.data
    });
    StaticComboBox.superclass.initComponent.call(this);
  }
});

var c = new StaticComboBox({
           name: 'Reasons',
           data: [
               {value: 0, label: 'a'},  {value: 1, label: 'b'}
          ]
         });
c.render(Ext.getBody());
c.setValue(1);