How to fill component from two data tables in NHibernate?

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C#

NHibernate

mapping

I have a NHibernate mapping. Inside I have a second thing:

<join table="tOrder">
 <component name="Driver" class="Contact">
  <property name="Email" column="DriverEMail"/>
  <property name="Fax" column="DriverFax"/>
  <property name="Phone" column="DriverTelephone"/>
 </component>
</join>

Works fine BUT also I have driver first name and last name stored in another table tDriver. So I lack of second properties:

<property name="FirstName" column="FirstName"/>
<property name="LastName" column="LastName"/>

Is it possible to fill some of component properties from another table? (Another join didn't done anything).