This seems just to simple, maybe I didn't understand, correct me if I make a mistake but what you need to do to pass parameters to a menu is as simple as this
xParameter1="Whatever"
xParameter2=Thisformdo MyMenu.mpr with xParameter1,xParameter2 && or =MyMenu(xParameter1,xParameter2)*:In MyMenu.mprLPARAMETERS xString, oObject