If you need to use a custom skin for RadMenu, you need to set EnableEmbeddedSkins
="false", not EnableEmbeddedBaseStyleSheet. The base stylesheet will not interfere with your custom skin no matter whether you manually register it or let it be served as a web resource automatically. Please, follow the instructions in the Skin registration
All the best,
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items.