Whilst app is running, RadialGauge needle colour not updated if system accent colour is change through Windows Settings App

I'm submitting a...

• Bug report (I searched for similar issues and did not find one)

Current behavior

The RadialGauge needle color does not change dynamically (when changing the system accent color from windows setting app whilst the app is running). However, the progress value color does change

Expected behavior

The needle color should also change whilst the app is running and someone change the accent color from the settings app.

Environment

Nuget Package(s): 
5.0.0
Package Version(s): 

Windows 10 Build Number:
- [ ] Fall Creators Update (16299)
- [x] April 2018 Update (17134)
- [ ] October 2018 Update (17763)
- [ ] Insider Build (build number: )

App min and target version:
- [ ] Fall Creators Update (16299) -> min target
- [ ] 1903 -> target

Device form factor:
- [x] Desktop
- [ ] Mobile
- [ ] Xbox
- [ ] Surface Hub
- [ ] IoT

Visual Studio 
- [x] 2017 (version: )
- [ ] 2017 Preview (version: )