Hi Don,

I'm glad to hear that I was able to help you! Thank you for the kind words for our support service.

I'm setting the status of the Feature request to declined as we will not proceed with an implementation, as the feature could be achieved with an application logic, similar to the one provided in the sample project that I sent earlier.

Should you need further assistance, please do not hesitate to open a new support ticket. 

Best Regards,
Vicky
Progress Telerik

Hi again,

As promised, I investigated the scenario and have prepared a sample project which demonstrates a possible way to achieve the desired end result.
The project has the Fluent theme applied using the implicit (NoXaml) styling mechanism. It includes helper classes and methods for getting the System's theme colors and overriding (and correspondingly updating) the Fluent theme palette's accent colors (AccentColor, AccentPressedColor, AccentFocusedColor, AccentMouseOverColor) with them when a system setting has changed.

Please, find the project attached to my reply, give it a try and let me know if it helps.

Regards,
Vicky
Progress Telerik

Hello Don,

The Telerik UI for WPF's suite comes with a variety of predefined themes.
Part of them is also the Fluent theme, which is inspired by the Fluent Design System and comes with built-in elements that provide interaction feedback and easy-to-customize colors. Our interpretation of it comes with two color presets - Light and Dark, which correspond to the Windows 10 colors.

However, all our themes are independent and do not rely on Windows settings or themes, which means that changing a color through your Windows settings won't have an effect on the Telerik's Fluent theme. You should still be able to achieve the desired look though by implementing some custom application logic. This requires further investigation on our side as well - we'll follow up with further information as soon as possible. In the meantime, I can suggest you checking out our:

• Telerik WPF Demos application, which by default shows all controls from the suite with the Fluent theme applied
• Color Theme Generator, which can be used as a tool for modifying the Fluent theme's colors to match the desired Windows settings.

I hope you find this information helpful. Please, take your time to explore the Fluent theme and let me know if it is what you are looking for.
I remain at your disposal in case any further questions arise.

Best Regards,
Vicky
Progress Telerik