How to create theme resource for DropShadowPanel colour

Question

What's the correct property to use for a theme resource colour for DropShadowPanel? The code I tried didn't work for me. I think SolidColorBrush needs to change to something else but don't know what that would be.

MainPage.xaml

<controls:DropShadowPanel BlurRadius="1" ShadowOpacity="1" OffsetX="0" OffsetY="2" Color="{ThemeResource ShadowColor}">

App.xaml

<SolidColorBrush x:Key="ShadowColor" Color="DimGray"/>

Answer 1

DropShadowPanel.Color is a Color, so you have to use

<Color x:Key="ShadowColor">DimGray</Color>