title: Angular 2 RC6 PrimeNG p-dropdown not getting disabled from component
body: <p>I am trying to disable the PrimeNg drop down on page initialization as follows</p>
  
  <pre><code>    this.searchForm = this.formBuilder.group({
         dropdown: [{value: '', disabled: true}]   
      });
  </code></pre>
  
  <p>But this gives an error on browser load as follows:</p>
  
  <pre><code>this.valueAccessor.setDisabledState is not a function
  </code></pre>
  
  <p>I am using PrimeNG drop down in HTML as follows:</p>
  
  <pre><code>       &lt;p-dropdown  [options]="[{label: 'Any', value: ''},{label: 'Active', value: 'active'},{label: 'Inactive', value: 'inactive'}]" id="dropdown" formControlName="dropdown" name="dropdown"&gt;
        &lt;/p-dropdown&gt;
  </code></pre>
  
  <p>Not sure if PrimeNg is not supporting this change from angular or I am doing something wrong. Any help is appreciated. Thanks.</p>