/// <summary>
/// Sets the superstate that the configured state is a substate of.
/// </summary>
/// <remarks>
/// Substates inherit the allowed transitions of their superstate.
/// When entering directly into a substate from outside of the superstate,
/// entry actions for the superstate are executed.
/// Likewise when leaving from the substate to outside the supserstate,
/// exit actions for the superstate will execute.
/// </remarks>
/// <param name="superstate">The superstate.</param>
/// <returns>The receiver.</returns>
public StateConfiguration SubstateOf(TState superstate)
{
StateRepresentation superRepresentation = _lookup(superstate);
_representation.Superstate = superRepresentation;
superRepresentation.AddSubstate(_representation);
return(this);
}