How to map XSD complex type nodes

Hello In my XSD I have complex type like this:

How to map this node to Target filed, I can not see PostalCode node my graphical editor:

<xs:element name="InternationalAddress" nillable="true" type="tns:InternationalAddress" />

  <xs:complexType name="CanadianAddress">

    <xs:complexContent mixed="false">

      <xs:extension base="tns:Address">

        <xs:sequence>

          <xs:element minOccurs="0" name="PostalCode" nillable="true" type="xs:string">

          </xs:element>

          <xs:element minOccurs="0" name="Province" nillable="true" type="tns:ProvinceCodes" />

        </xs:sequence>

      </xs:extension>

    </xs:complexContent>

  </xs:complexType>