@milancurcic I am with you. Indeed, I never tried to pass a generic name as dummy, but close to it. Currently, I am trying to forcing my self to adopt Damian's teaching about OO and in similar cases I am trying to adopt something like strategy pattern, but I do not know if this can fit with your case. Anyhow, I was not aware about the limitations involved in passing generic name as dummy. What solution you have eventually adopted? The wrapper suggested by Vladimir? OHHH, I just see that Vladimir is indeed @LadaF ! We have another guru here :tada: :tada: