Ok, I'm going to admit up front that I've been out of the WPF game for about a year, and some of the differences between WPF and Windows Store App XAML is driving me mad. This should be a simple question, I just have a mental block for some reason.

I have a style for a ColorPicker to use in my Windows 8 app. Here it is:

<Style x:Key="ColorPickerStyle" TargetType="ListBox">
        <Setter Property="ItemsPanel">
                    <StackPanel Orientation="Horizontal" Background="AliceBlue" HorizontalAlignment="Stretch" VerticalAlignment="Top" />

        <Setter Property="ItemTemplate">
                    <Rectangle x:Name="recData" Width="20" Height="20" Fill="{Binding}" Stroke="Black" StrokeThickness="1"/>

Here is what it looks like when it's displayed:

I love the way it looks, but the last I'd like to do is change how the selected color looks. All I want to do is remove the selected item color and make the selected item's rectangle have a StrokeThickness of 2. I tried to do this with triggers, but they don't seem to exist in WSA XAML. I tried to do it with the VisualStateManager, but I somehow kept messing up the XAML so that it crashes when I run.

Can someone help me through this before I lose my freakin' mind?