Vista - How to determine index of TabItem

Hi Everyone,

I am creating a control template for TabItem and cannot figure out how to
determine if the TabItem is the first tab. I am doing this because I want the
first tab to have a different shape. It would be great if the ItemsControl
class had a readonly attached property for this but as far as I can tell, it
does not. Does anyone know the best way to do this?

I have attached a bit of my style to give you an idea of what I am trying to
do (watch for wrapping):

<ControlTemplate.Triggers>
<Trigger Property="Name" Value="Chart"> <!-- There has to be a better way
to do this -->
<!-- It would be great if we could do the following:
<Trigger Property="ItemsControl.Index" Value="0">
-->
<Setter TargetName="FirstTabLeftWingShadow" Property="Visibility"
Value="Visible" />
<Setter TargetName="LeftWingShadow" Property="Visibility" Value="Collapsed"
/>
<Setter TargetName="FirstTabLeftWing" Property="Visibility" Value="Visible"
/>
<Setter TargetName="LeftWing" Property="Visibility" Value="Collapsed" />
<Setter TargetName="LeftColumn" Property="Width" Value="16" />
</Trigger>
....

--
Thanks,
-Neal Borelli