Michael,

Ok, In VFP it would be

oVol = createobject("clsVolatility")
oVol.DateRange = Createobject("clsDateRange")

***************************************
DEFINE CLASS clsVolatility AS CUSTOM
***************************************

Volatility = 0
DateRange = .null. && create a property to hold the object reference

function Destroy
DateRange = .null. && clean up
endfunc

ENDDEFINE

***************************************
DEFINE CLASS clsDateRange AS CUSTOM
***************************************

StartDate = {}
EndDate = {}

FUNCTION IsEmpty()
RETURN (THIS.StartDate = {} AND THIS.EndDate = {})
ENDFUNC

ENDDEFINE

Realize that objects created like this can not participate directly in a UI, these will be buinessrule kinds of objects.

>Sorry, I know I'm not explaining this very well...I want to be able to set the DateRange property of clsVolatility to an externally created clsDateRange object. In VB this would be:
>
>Set oVol.DateRange = oDate