Container types with interfaces

Hi all,

I've a question regarding supported types in freemarker. Is it possible 
to access a container on a class Foo as defined below in a freemarker 
template ?

public class Foo {

     private Map<String, IType<?>> nestedProp;

     public .. getNestedProp() {..}

     public setNestedProp(..) {..}

}

public interface IType<T> {

     public String getIdentifier();

     public String getDescription();

     public T getValues();

}

public class EnumType implements IType<Set<String>> {..}

public class IntegerType implements IType<Set<Integer>> {..}



When I try to access the property in a template by checking with 
foo.nestedProp?exists the latter always returns false.

I had a look on the docs and especially the beanwrapper description but 
could not find more infos about my specific question.

Thanks and Regards,

  Alex

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