Template Binding with Attached Properties

I think TemplateBinding is evaluated at compile time so you can’t dynamically set a TemplateBinding in your Setter, try using Binding instead (see below).

<Setter TargetName="border" Property="BorderBrush" 
        Value="{Binding Path=(local:ThemeProperties.ButtonBorderColour),
                        RelativeSource={RelativeSource TemplatedParent}}"/>

Hope this helps.

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