importing partial schemas

The documentation states that to import a schema into another schema, one has to click the root node of the target schema, then goto the properties screen and select the schemas to be imported in the import collections section of the advanced section of the properties screen.

 Problem:

when I follow the above procedure, all I get is a blank schema. When I try to include a section or one of the imported partial schemas, I can't find the process to include the partial schema into the target schema. I'm using the BS schema editor on VS2005

What am I doing wrong.

BTS: V2006, VS:2005, SQL:2005, OS:2003 ENTERPRISE SP1 with all current updates.

Partial shemas. 

<?xml version="1.0" encoding="utf-16"?>
<xs:schema xmlns:b="http://schemas.microsoft.com/BizTalk/2003" xmlns="http://B5.PartialSchemas.Customer" targetNamespace="http://B5.PartialSchemas.Customer" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="Customer">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="FirstName" type="xs:string" />
        <xs:element name="LastName" type="xs:string" />
        <xs:element name="MiddleInit" type="xs:string" />
        <xs:element name="Age" type="xs:string" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

<?xml version="1.0" encoding="utf-16"?>
<xs:schema xmlns:b="http://schemas.microsoft.com/BizTalk/2003" xmlns="http://B5.PartialSchemas.Address" targetNamespace="http://B5.PartialSchemas.Address" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="Address">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="AddressLine1" type="xs:string" />
        <xs:element name="AddressLine2" type="xs:string" />
        <xs:element name="AddressLine3" type="xs:string" />
        <xs:element name="City" type="xs:string" />
        <xs:element name="State" type="xs:string" />
        <xs:element name="Zip" type="xs:string" />
        <xs:element name="Country" type="xs:string" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

Target Schema

<?xml version="1.0" encoding="utf-16"?>
<xs:schema xmlns:aa="http://B5.PartialSchemas.Address" xmlns:b="http://schemas.microsoft.com/BizTalk/2003" xmlns="http://B5.Cannon" xmlns:bb="http://B5.PartialSchemas.Customer" targetNamespace="http://B5.Cannon" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:import schemaLocation="partialschemas\customer.xsd" namespace="http://B5.PartialSchemas.Customer" />
  <xs:import schemaLocation="partialschemas\address.xsd" namespace="http://B5.PartialSchemas.Address" />
  <xs:annotation>
    <xs:appinfo>
      <b:references>
        <b:reference targetNamespace="http://B5.PartialSchemas.Address" />
        <b:reference targetNamespace="http://B5.PartialSchemas.Customer" />
      </b:references>
    </xs:appinfo>
  </xs:annotation>
  <xs:element name="Cannon">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="Address">
          <xs:complexType />
        </xs:element>
        <xs:element name="Customer">
          <xs:complexType />
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

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