How to expose an Item Group defined in a csproj file to targets called afterward by Team Build?

Visual Studio project files contain a wealth of metadata. I want to capture some of the elements from a particular project in such a way that overridden Team Build targets can refer to them later in the process.

Let's say I have a project named ProjectFoo.csproj that looks like:

<Project ToolsVersion="3.5" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    ...etc...
  </PropertyGroup>  
  <ItemGroup>    
    <Reference Include="ProjectBar, Version=1.0.0.0, Culture=neutral, PublicKeyToken=asdf" />
    <None Include="Web.config" />    
    <Content Include="Index.aspx" />
    <Folder Include="Images" />
    <Compile Include="Code\MenuBuilder.cs" />
    <EmbeddedResource Include="Properties\licenses.licx" />    
    ...etc etc etc...
  </ItemGroup> 

  <!-- try to create & output some items dynamically -->
  <Target Name="AfterCompile" Outputs="@(ResourcesInFoo)">    
    <ItemGroup>
      <ResourcesInFoo Include="@(EmbeddedResource)" />
    </ItemGroup>
  </Target>
</Project>

Then in my Team Build scripts, I might have a snippet along these lines:

<Target Name="AfterDropBuild">
    <DoSomething Files=@(ResourcesInFoo) />
    <DoSomethingElse Param=@(FoldersInBar) />
    <!-- etc -->
</Target>

My understanding is that Team Build builds the projects by invoking the <MSBuild> task on each project file. And according to http://social.msdn.microsoft.com/Forums/en-US/msbuild/thread/4ca448c3-d571-4a4b-b96e-755309cd1a97, an Item that's created dynamically+ explicitly outputted from that target should become globally available (except to the immediate caller). Thus, I expected the <AfterCompile> override seen in my sample project file to work. It does not.

Are my assumptions about ItemGroup scope incorrect? Is there a completely different / better supported way to get what I want? Right now I'm offloading the entireprocess to Powershell via <Exec>, re-parsing the desired *proj files using native XML and operating on the resultsimperatively,but that feels like a hack.

How to expose an Item Group defined in a csproj file to targets called afterward by Team Build?

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