Passing a null datetime object via soap causes Flex to create
a Date object with the current date. There are times when you want
a datefield to be blank because may be a user hasn't set a date
yet. Prior to 2.0.1 I was able to pass via soap a null datetime
object. But, now Flex automatically converts the null to the
current date, which would be misleading when displayed to the user.
This conversion should not be automatic.