Where to place functions for add, delete in composite pattern

Composite pattern is useful for handling part-whole hierarchies. It has an interface for the Component. Leaf and Composite both provide implementation for the Component interface.

What should be the implementation for Add(Component c), Remove(Component c) and GetChild(int position) methods in Leaf class ?

I can have methods do nothing, or throw an exception like : OperationNotSuportedByLeafException. But Doing this will break the Liskov substitution principle. What is the best way to handle these methods ?