title: How to set combobox's value from extjs controller
body: <p>I am working in extjs4. I have combobox with code as-</p>
  
  <pre><code>{
  margin:'7 6 5 5',
  xtype:'combobox',
  fieldLabel:'Language',
  name:'language',
  id:'combo',
  width:190,
  allowBlank:false,
  emptyText: '--Select language--',
  labelWidth: 60,
  store: new Ext.data.ArrayStore({
      fields: ['id','value'],
      data: [
          ['1','Marathi'],
          ['2','English']
      ]
  }),
  queryMode: 'local',
  valueField:'id',
  displayField:'value',
  editable:false
  },
  </code></pre>
  
  <p>Throuhout my functioning I want to set combobox's value defaultly to user's selected choice. So how to set combobox's value from controller</p>