.Net 4.5 application: Unable to determine Active Directory Group membership for nested groups

I have an ASP.Net 4.5 application using integrated security.  I have no problem finding the groups the logged in user is directly a member off but am unable to return the groups they are a member of via nested group membership.  

The code below returns only user who are directly a member of the group:

var MyDomain = new PrincipalContext(ContextType.Domain, "MyDomain");
GroupPrincipal grp = GroupPrincipal.FindByIdentity(MyDomain, IdentityType.Name, "MyGroupName");

foreach (var p in grp.GetMembers(true))
	testing += p.Name + "<br>";

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And this code returns only groups the user is directly a member of:

var MyDomain = new PrincipalContext(ContextType.Domain, "MyDomain");
UserPrincipal usr = UserPrincipal.FindByIdentity(MyDomain, Request.LogonUserIdentity.Name);

foreach (var p in usr.GetGroups())
	testing += "<br>" + p.Name;

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How can I retrieve all the users associated with a given group or all the groups associated with a given user?

Ideally I want to ask "Is this user a member of this group" like the functionality the IsMemberOf() provides.  This is how I started this only to find that the method does not support nested groups either.