""All Day Event"" Check Box Issues

Hi

I'm using a custom Appointment form for a shared calendar in Outlook
2007.
I've added Outlook Date/Time Controls for start/end and they work fine.
However, the 'All Day Event' check box doesn't influence the date/time fields
as it does on the default Appointment form.

Also, as soon as I pick a start date/time on the default form, the end date/time moves 30 minutes past start,but this doesn't happen on my custom form either. How can I get start, end,and 'all day' to recognize each other?

Thanks in advance.