Hi George,
Thanks for contacting Syncfusion support.
We have checked the reported query “Our custom control will function properly with syncfusion themes”. SfSkinManager helps you to apply the themes for both Syncfusion and Framework controls. There are 27 built-in themes that can be applied using the SfSkinManager for a rich user interface experience.
If you inherit any of the syncfusion controls, you can use SfSkinManager to apply themes to the derived control. Call the SetResourceReference method, passing the StyleProperty and derived control type as parameters.
In addition, you can use a custom theme in your application. You can use ThemeStudio to export the custom theme project. It allows users to quickly transform their visual presentation into a new theme.
If you require any additional information, could you please specify the specific syncfusion controls? This will allow us to check and update the solution accordingly.. Please let us know if you need any further assistance.
Regards,
Thirupathi B.