How to get the Service drop down do show on a calendar?

By the description of the short-codes, I thought that if I use:

[app_monthly_schedule]

[app_confirmation]

The calendar would give me a drop down with all the services available for me to choose, but this is not happening.

Even when I tried to specified a service using

[app_monthly_schedule service="5"]

[app_confirmation]

The confirmation information showed me that it was in fact using the service = 1

What am I missing?

Thanks