title: Hide only Tab Header and not TabItem on count 1
body: <p>I have a TabControl that creates the TabItems from a ObservableCollection.
  So in my ViewModel I already have a boolean Property IsMultiple and already gets set in code. So how do I hide the Tab header completely, but still display the content of that tab.
  I have this:</p>
  
  <pre><code>&lt;TabControl ItemsSource="{Binding myObservableCollection}" 
   ItemContainerStyle="{StaticResource myTabItemStyle}"
   Style="{StaticResource myTabStyle}"&gt;
    &lt;TabControl.ItemTemplate&gt;
      &lt;DataTemplate&gt;
        &lt;TextBlock Text="{Binding myTabHeaderTextProperty}" /&gt;
      &lt;/DataTemplate&gt;
  &lt;/TabControl.ItemTemplate&gt;
  &lt;TabControl.ContentTemplate&gt;
      &lt;DataTemplate&gt;
      &lt;DataTemplate&gt;
  &lt;/TabControl.ContentTemplate&gt;
  </code></pre>
  
  <p>Basically I want to hide the itemtemplate, note that I cant just hide the TextBlock, because the style then still is there only with empty text. I want to remove/Hide the complete Tab header.</p>