We are sorry to hear that you have difficulties with your custom theme for WPF. We understand your point and we are already working on a new help topic covering all issues related to the custom themes in WPF.
Meanwhile please replace all references to
with references to your custom theme project.
Also you need to replace all Expression_DarkThemeExternal
with the name of your custom theme.
Please try this and let me know whether this helps. If you need additional help, I will prepare a sample project for you.
All the best,
the Telerik team
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