We are using implicit themes and all we want to do is change the transparency of the highlight color (i.e. increase it) for the gridrow when it is selected. Depending on the theme selected the selected highlight color changes and we want to keep that functionality but merely make it more transparent. I understand that we could go change all of the underlying XAML files and recompile the assembly but for such a small change we would rather not do that. Can you suggest any other way of accomplishing this. Thank you