Thanks, getting more documentation on how to use these components from the Radzen IDE with some real life examples would be most appreciated, especially for users like me who use your IDE because we may not be as proficient developers as some of those who use your free components 
I think it would fit well with your targeted customers.
As far as category.Include(), Include() is not a valid method for a single object, it only applies to a collection of objects, more like context.Categories.Include(c => c.Products). Your own code in the online demo Blazor Tree | a free UI component by Radzen simply uses category.Products without Include(). So how can I accomplish what category.Include(c => c.Products).Products is trying to accomplish? (this code won't compile)
Thanks!