Nested Web Performance Tests in Visual studio

Problem: When running a WebTest (WT1) with a defined datasource that calls another webtest (WT2) with another datasource, using the settings "one run per datasource row" the tests are executed x times the datasource with more rows.

Example:

WT1

-->www.google.com

-->WT2

WT1 DataSource (2 rows)

WT2

-->www.microsoft.com

WT2 DataSource ( 3 rows)

Expected :

-->Google
    -->microsoft
    -->microsoft
    -->microsoft
-->google
    -->microsoft
    -->microsoft
    -->microsoft

Observed :

-->google
    -->microsoft
-->google
    -->microsoft
-->google
    -->microsoft