To show a theme in the list of available themes for a control, the theme file must be available. In your case the theme is added as a resource to your assembly and is used as a resource. In order to do so, you have to build first the assembly so the theme will be inside that assembly.
In the attached movie you can see how it is done - the steps are:
- Create the theme file
- Add it as embedded resource
- Build the assembly
- Use "Load theme from resources" for the ThemeManager to add the theme to the list of available themes.
As in the movie can be seen the theme is added in the list of available themes and is applied correctly.
the Telerik team