title: how to pass named optional parameter defined in dart method to ng-click attribute
body: <p>I have a method in dart, let's call it <code>showSomething()</code>, which has "named optional parameters"</p>
  
  <pre class="lang-dart prettyprint-override"><code>    // the following method is in a model called ctrl.  
      void showSomething(bool _bool, {var content}){
        ....
      }
  </code></pre>
  
  <p>In dart, we can use the method like <code>showSomething(true, content:whatever)</code> or simply <code>showSomething(true)</code>. </p>
  
  <p>Now in html, I have a tag
      <code>&lt;div ng-click="ctrl.showSomething(true, content:something)"&gt;&lt;/div&gt;</code></p>
  
  <p>Yeah, just like what you have seen, I use it the same way within dart code, but it doesn't work. Anyone got ideas?</p>