Change Opaticy of Tab Item In an Items Control - wpf

Question

I have a data bound tab control:
<TabControl ItemsSource="{Binding Products}" Name="ProductsTabControl">
<TabControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Name}"/>
</DataTemplate>
</TabControl.ItemTemplate>
</TabControl>
This control is showing one tab per product, however I would like to make the tabs of discontinued products semi-transparent (i.e. set their opacity to 0.2). How can I change the opacity property of the tabitem when the item is being auto generated. I know I could use a style to change them all, but I only want to change those which are discontinued.

Answer 1

In ItemsContainerStyle for TabControl, create a DataTrigger where you bind to your property (e.g IsDiscontinued) and set the Opacity from there
<TabControl ItemsSource="{Binding Products}" Name="ProductsTabControl">
<TabControl.ItemContainerStyle>
<Style TargetType="TabItem">
<Style.Triggers>
<DataTrigger Binding="{Binding IsDiscontinued}" Value="True">
<Setter Property="Opacity" Value="0.2"/>
</DataTrigger>
</Style.Triggers>
</Style>
</TabControl.ItemContainerStyle>
<TabControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Name}"/>
</DataTemplate>
</TabControl.ItemTemplate>
</TabControl>
Update
If you want to make the Content of the discontinued tabs semi-transparent you can do the same thing, but in the DataTemplate
<TabControl ItemsSource="{Binding Products}" Name="ProductsTabControl">
<TabControl.Resources>
<DataTemplate DataType="{x:Type local:Product}">
<Border Name="bg" BorderBrush="Black" BorderThickness="1">
<TextBlock Text="{Binding Name}"/>
</Border>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding IsDiscontinued}" Value="True">
<Setter TargetName="bg" Property="Opacity" Value="0.2"/>
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</TabControl.Resources>
<!--...-->
</TabControl>