How to Change Calender daily view static time slot from 30 to 15 minutes

I want to change the time resolution of week view or daily view vaadin calender from static 30 minutes to custom time slots. i mean now the default time slot of 1 hr is divided into 30 minutes but is it possible to change it to 15 or less minutes time slot.

using vaadin 6.8.12 and latest version of vaaddin calender 6

Following ticket is already opened and closed but can any body teel me is this fixed and how can i do in my release.

Thanks. mubi