title: Angular Nativescript visibility defaults to true, even when variable is initialized
body: <p>Is there a way to default "hide" an element in Nativescript?</p>
  
  <p>I have in my component</p>
  
  <pre><code>export class HouseholdContactComponent{
    private isLoading = true
  }
  </code></pre>
  
  <p>and in my xml</p>
  
  <pre><code>&lt;StackLayout [visibility]="isLoading ? 'collapse' : 'visible'"&gt;
    &lt;Label text="Hi there"&gt;&lt;/Label&gt;
  &lt;/StackLayout&gt;
  </code></pre>
  
  <p>With this code, the screen flashes the "Hi there" message and then it goes away.</p>