Ninject dependency injection with Decorator pattern

Use WhenInjectedInto:

Bind<IRepository>().To<MoreAdvancedRespository>()
                   .WhenInjectedInto<TrickyRepository>();
Bind<IRepository>().To<SomeSimpleRepository>()
                   .WhenInjectedInto<MoreAdvancedRespository>();

See this blog post for more info.