I have actually the same Problem as this guy: https://www.telerik.com/forums/themes---why-is-this-so-difficult
I've created a custom theme in a tssp file and I'm struggling applying it. As the Person in the other thread says adding it to theme Manager results in a Exception. The link in the answer says that I could just set the ThemeName Property of the control to the name of the Control but this seems neither to be working.
I can't figure out how this should be done...
Thank You for your help