Using DTE Automation, how can I change the Platform

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.NET

Hi
I'm using VS 2012 and am trying to use DTE to change the configuration to Release and set all Project's Target Platform to Any.

Can anyone tell me how can I change the Platform, as the property is ReadOnly?

Public Sub BuildRelease()
    ' Refrence the Solution Build object
    Dim oSB = Connect.oDTE2.Solution.SolutionBuild

    ' Get the Active Configuration
    Dim oConfig = oSB.ActiveConfiguration

    ' Set each Project Configuration to Release & set platform to 'Any'
    For Each context As SolutionContext In oConfig.SolutionContexts
        context.ConfigurationName = "Release"

        ' Need the change the Platform to Any here !!!!!
    Next

    ' Build the Solution
    oSB.Build(True)
End Sub

Thanks
JP