I am trying to build a customized DateTimePicker control to handle null
values.  One restriction I have to place on the control is to set the MaxDate
to the current sytem date and time.  However when I use my customized date
control, the MaxDate value doesn't refresh to the current time when I am
ready to save the value to the database.  It holds the initial system
date/time assigned when the control loads.  This is not the case when I use
the original DateTimePicker.  I test this out by returning the
DateTimePicker.Value.ToString in the original control and in my customized
control.  The time in the original control gets refreshed and matches the
current time, however on the customized control, the time doesn't reflect the
most current time.

In handling the null value situation, I am overriding the following methods:
OnKeyDown, OnCloseUp, and overriding the Value property.

Thanks,
Lynn