SortedDictionary methods

[phalaris_trip]

I have a method that creates a sorted dictionary of things

SortedDictionary<string, MyClass> sortedStuff = new SortedDictionary<string, MyClass>();

// add some items to sortedStuff

now all I want to do is retrieve the "maximum" value from the dictionary, where maximum is determined by the comparison of two strings keys such that
s1.CompareTo(s2) > 0

I am vaguely aware of predicates, IComparer interfaces and also First<> and Last<> but I can't figure out how to use them...

Thanks in advance,