Portfolio aggregators and Thrift Savings Plan (TSP)

Does anyone know if any of the online portfolio aggregators can accurately handle tracking a Thrift Savings Plan (TSP) account?

I have tried this with Fidelity and Personal Capital, but their systems do not know what the underlying funds (C S I F G) hold so it cannot include it in asset allocation analysis. Obviously this is a severe limitation if the TSP is a big hunk of your net worth.

Thanks for any recommendations!