I want to use the SqlExpress2008 Bootstrapper for a new installation on Windows7, I do not want to use the default SQLEXPRESS Instance.

I have attempted to edit the package.xml file located in: C:\Program Files\Microsoft

SDKs\Windows\v7.0A\Bootstrapper\Packages\SqlExpress2008\en\package.xml

and updated the command argument instancename=CUSTOMINSTANCE

But unfortunately it still creates the default SQLEXPRESS not CUSTOMINSTANCE

The wix tag is as follows:

                <sql:SqlDatabase
              Id="SqlDatabaseCore"
              ConfirmOverwrite="yes"
              ContinueOnError="no"
              CreateOnInstall="yes"
              CreateOnReinstall="no"
              CreateOnUninstall="no"
              Database="MyDatabase"
              DropOnInstall="no"
              DropOnReinstall="no"
              DropOnUninstall="no"
              Instance="[SQLINSTANCE]"
              Server="[SQLSERVER]">
              <sql:SqlFileSpec
                Id="SqlFileSpecCore"
                Filename="[CommonAppDataFolder]MyCompany\Database\MyDatabase.mdf"
                Name="MyDatabase" />
              <sql:SqlLogFileSpec
                Id="SqlLogFileSpecCore"
                Filename="[CommonAppDataFolder]MyCompany\Database\MyDatabase.ldf"
                Name="MyDatabaseLog" />

Is this the standard way to accomplish this?