Hello Caroline Jaensch,
Thank you for the question
Generally, you can set a theme only at a control level. Themes cannot be set at an element level. This behavior is designed to bring you performance optimizations.
Still, there is a way to apply a custom style for a RadButtonElement. In order to do so, you should take the style from an existing theme containing settings for a button and then apply this style to the desired button element:
|StyleBuilder builder = ThemeResolutionService.GetRegisteredControlStyleBuilder(
|if (builder != null)
I am attaching a sample project which demonstrates this approach. If you have additional questions, feel free to contact me.
the Telerik team