That's definitely possible. You can use the list box's On Dbl Click event to open your AppointmentF filtered to the selected appointment. That's actually very similar to what I cover later in the seminar when we double-click an appointment on the calendar to open it.

To add a brand-new appointment by double-clicking an empty day area is also possible, but it requires a little more work since the calendar needs to know which date box was clicked. You could have the double-click event open AppointmentF in data-entry mode and pass that day's date in the OpenArgs parameter, then set the appointment date in the form's Load event.

It's a handy feature, especially for people who use the calendar as their primary interface.

Thanks Richard