title: Refreshing Combo box data in extjs 4
body: <p>Getting stuck on refreshing data of combo box in Extjs 4, 
  on button click trying to reload combo data by reloading store - </p>
  
  <pre><code>Ext.StoreManager.lookup('test').load();
  </code></pre>
  
  <p>Store is reloading but data doesn't reflecting on combo box.</p>
  
  <p>Is there any way?</p>
  
  <pre><code> {
      xtype         : 'combo'
     ,fieldLabel    : 'Default Role'
     ,name          : 'org_default_role'
     ,store         : Ext.create('ASA.store.Roles')
     ,displayField  : 'role_rolename'
     ,valueField    : 'role_id'
     ,queryMode     : 'local'
     ,labelWidth    : 100
     ,width         : 241
     ,triggerAction : 'all'
  }
  </code></pre>