title: Radio button for boolean property
body: <p>I have a simple boolean property <code>valid</code> in my object <code>document</code>
  and need to bind it to radio-inputs.</p>
  <p>This is what I have so far:</p>
  <pre class="lang-html prettyprint-override"><code>&lt;input type=&quot;radio&quot; name=&quot;valid&quot; id=&quot;validTrue&quot; (click)=&quot;document.valid = true&quot; [checked]=&quot;document.valid&quot;/&gt;
  &lt;input type=&quot;radio&quot; name=&quot;valid&quot; id=&quot;validFalse&quot; (click)=&quot;document.valid = false&quot; [checked]=&quot;!document.valid&quot;/&gt;
  </code></pre>
  <p>At least setting the property on click works but its state is not displayed by the radio-inputs. Looking in the developer console of my browser I found out that a property <code>ng-reflect-checked</code> is set but it doesn't seem to have impact on the HTML radio-input.</p>
  <p>What am I doing wrong?<br />
  Does anyone have a working &quot;angular2-boolean-radio-input&quot; snippet?</p>