title: Changing value of a combo box Ext.form.ComboBox Ext JS
body: <p>I am having a little trouble setting the value of a combo box within the code.</p>
  
  <p>I have the following select box</p>
  
  <pre><code>new Ext.form.ComboBox({
               id: 'address_type',
               name: 'address_type',
               editable: false,
               disableKeyFilter: true,
               forceSelection: true,
               fieldLabel: 'Type',
               emptyText: 'Please Select',
               triggerAction: 'all',
               mode: 'local',
               store: new Ext.data.SimpleStore({
                id: 0,
                fields: ['value', 'text'],
                data : [['Home', 'Home Address'], ['Work', 'Work Address']]
               }),
               valueField: 'value',
               displayField: 'text',
               hiddenName: 'address_type'
              })
  </code></pre>
  
  <p>So surely if I executed:</p>
  
  <pre><code>Ext.getCmp('address_type').setValue('Work')
  </code></pre>
  
  <p>Would set the value of the select box to 'Work Address'? However it doesn't appear to work.</p>
  
  <p>Any advice appreciated, thanks.</p>