Need help on implementing/ adding new controls or region next to ALL DAY EVENT in an outlook appointment page.

Question

HI All,
Need help on implementing/ adding new controls or region next to ALL DAY EVENT in an outlook appointment page.
I want to add a  radio button next to ALL DAY EVENT in an outlook appointment page. I am able to add a form region addin to the appointment page, but the position of the form region is in the bottom of the page. I want to change the poistion of the form region
Any pointer or helps will be great
Thanks
Mathew