Work-around for Struct with Entity Framework, Code-First approach

I'm currently constructing a database from an existing system with EF and code-first approach. It is preferred that minimal changes is made to the 'core' classes. Because of this I would like to find a work-around for Structs and EF. Is it possible to wrap a Struct into a class in any way so that EF can use the data within this Struct? Since EF are able to create its own Proxies of my 'core' classes, shouldn't I be able to this as well? My knowledge about .Net, C# and EF is rather limited because I started to learn this language this year due to a bachelor assignment. Any help would be highly appreciated. Edit: Added examplecode. Core has many classes that utilizes the TaxMode Struct, and store data in this Struct. ``` public class AcmeClass { TaxMode Taxmode { get; set; } } ``` The Struct is as follows: ``` public struct TaxMode { public string Name { get; set; } public bool isTrue { get; set; } } ``` Any attempt to add the properties of `TaxMode` into those classes only result in non-nullable errors.