NHibernate - one-to-one Mapping - nhibernate

Question

I have a one-to-one relationship between a Person class and an Employee. I expect the INSERT to cascade from the Person to the Employee. However, this does not happen. I've tried cascade='all' and cascade='save-update' on one-to-one relationship element, but it didn't work. I have also uploaded my entire source code on: http://bit.ly/gnkxBr (3.52 MB)
The structures of the my objects are as follows:
public class Person
{
public virtual Employee Employee { get; set; }
public virtual int Age { get; set; }
public virtual string Forename { get; set; }
public virtual string Surname { get; set; }
public virtual int PersonID { get; set; }
}
public class Employee
{
public virtual int PersonID { get; set; }
public virtual string PayRollNo { get; set; }
public virtual int Holidays { get; set; }
public virtual Person Person { get; set; }
}
Mapping files shown below:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="Person, Employee.DAL" table="`Person`" >
<id name="PersonID" column="`PersonId`" type="int">
<generator class="native" />
</id>
<property type="string" name="Forename" column="`Forename`" />
<property type="string" name="Surname" column="`Surname`" />
<property type="int" name="Age" column="`Age`" />
<one-to-one name="Employee" class="Employee" cascade="all" />
</class>
</hibernate-mapping>
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="Employee, Employee.DAL" table="`Employee`" >
<id name="PersonID" column="`PersonId`">
<generator class="foreign">
<param name="property" >Person</param>
</generator>
</id>
<property type="string" length="30" name="PayRollNo" column="`PayRollNo`" />
<property type="int" name="Holidays" column="`Holidays`" />
<one-to-one name="Person" class="Person" constrained="true" />
</class>
</hibernate-mapping>

Answer 1

Put the session.Save() method in a transaction. Or use the session.Flush() method after calling the save method.