Vaadin Calendar Component

When the user clicks on any calendar event how can I get the Calendar Event ClientX() and ClientY () cordinates.

I am trying to acheive the same thing
https://www.google.com/calendar/embed?src=c9pprt0v3mkrp9dvmk395q9j8s@group.calendar.google.com
, so when the user clicks on the Calendar event I want to display a prompt on the event clicked. How can i acheive this? Any thoughts are greatly appreciated.