getting "registers" to show in a custom debug engine

to get "registers" to show in a VS DE, I set Registers to 1 in the registry. I get a IDebugStackframe2 EnumProperties call with guidFilterRegisters, i return 1 group with the name "General Purpose Registers" which has children for each of the cpu registers. EnumChildren even gets called on this, and I return a debug_property_info list with name, fullname, value, attrib (rawstring/access_all/storage_registr/data) & property set
However, it still shows "No data available"
what am I missing?

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Carlo Kok