Access to GH_Param->VolatileData

Hi everyone!

I've attached some persistent data to GrassHopper params (Slider, Number, Integer and Curve) (well in Slider data implicit at knob position).

I need to recovery this data using the SDK IGH_PARAM::VolatileData, but this structure is always empty for all params.

Doing casting to GH_NUmberSlider I can recovery the value without problems 

¿any idea?

Thank's!

....

for each (IGH_DocumentObject^ pObject in pObjects)
{
    IGH_Param ^pParam = dynamic_cast<IGH_Param^>(pObject);

    if (pParam != nullptr)
    {
        IEnumerator ^allData;

        allData = pParam->VolatileData->AllData(true)->GetEnumerator();
        allData->Reset();

        // Always TRUE!
        assert(pParam->VolatileData->IsEmpty == true);

        /* Param without data */
        if (allData->MoveNext() == false)
        {
           // Always this branch
           i_DEBUG_STR(L"NULL DATA", 0, true);
        }
        /* Param with data */
        else
        {
           // Never this branch

            IGH_Goo ^data;
            data = (IGH_Goo^)allData->Current;

            // Data treatment
            ...
         }

         { 
             GH_NumberSlider ^slider;

             slider = dynamic_cast<GH_NumberSlider^>(pParam);

             if (slider != nullptr)
             {
                // The slider value is correct
                double value
                value = Decimal::ToDouble(slider->Slider->Value);
             }
         }
     }
}