title: Emberjs classBinding not working on a link-to
body: <p>I'm using the <code>link-to</code> helper to provide some movement around my application, as usual.  I'm trying to use the <code>classBinding</code> property to assign a CSS class, <code>hide</code>, to a link.  It's not working, and I'm not sure if it's because I'm misunderstanding context, or what, really.</p>
  
  <p>Here is the relevant part of the template for the link:</p>
  
  <pre><code>{{#each SimpleSearchOptions}}
      {{#if isResultsView}}
          {{#link-to 'simpleSearchResults' tagName='li' classNames='chosentab' href=false}}
              &lt;a&gt;&lt;span&gt;{{qname}}&lt;/span&gt;&lt;i class="icon-info-circled helpiconleft"&gt;&lt;/i&gt;&lt;/a&gt;
          {{/link-to}}
      {{else}}
      {{#link-to 'simpleSearchOption' this tagName='li' classNames='chosentab' classBinding='hidden:hide' href=false}}
          &lt;a&gt;&lt;span&gt;{{qname}}&lt;/span&gt;&lt;i class="icon-info-circled helpiconleft"&gt;&lt;/i&gt;&lt;/a&gt;
      {{/link-to}}
      {{/if}}
  {{/each}}
  </code></pre>
  
  <p>And here is part of the model that it is based off of:</p>
  
  <pre><code>App.SimpleSearchOptions = [
      {
          "id" : 0,
          "qname": "Application",
          "description": "When you open a door you need one of these applications.",
          "answers": [
              {
                  "value" : "*",
                  "title": "Any / Unknown",
                  "description": "Unknown or variable Applications.",
                  "qname": "Application"
              },
              {
                  "value" : 1,
                  "title": "Building Temperature Control",
                  "description": "Prevents warm air from leaving a heated building or cool air from leaving an air-conditioned one.",
                  "qname": "Application"
              },
          .....   
          ]
      },
      {
          "id" : 7,
          "qname": "Heating Power",
          "description": "If a unit is heated using electricity, different amounts of power (in kW) are available.",
          "hidden": true,
          "answers": [
              {
                  "value" : "*",
                  "title": "Any / Unknown",
                  "description": "",
                  "qname": "Heating Power"
              },
              {
                  "value" : "B",
                  "title": "6",
                  "description": "",
                  "qname": "Heating Power"
              },
              {
                  "value" : "C",
                  "title": "6.1",
                  "description": "",
                  "qname": "Heating Power"
              },
             ......
  </code></pre>
  
  <p>That first <code>{{#if ResultsView}}</code> works just find when I later dynamically add an element to the <code>SimpleSearchOptions</code> array.  Why does the <code>classBinding='hidden:hide'</code> not work, then?</p>
  
  <p>Thanks for the help.</p>