I'm not sure exactly what they used.
The Flextras Calendar has a week view and can look similar to that pretty easy by using a custom DayRenderer with a styled list. If you want more advanced gantt chart style editing [like Google Calendar] you'd need a Gannt Chart Component for Flex; which we're working on.
Free developer editions are available so you can download and test it out. Let us know how we can help.
But when i saw your application , it does not has the calendar similar to that show in the video. I need a view similar to that of shown in the weekly view. In your app al the events are listed out in the grid. I need some graphics in place of the grid data. like a rectangle drawn showing the scheduled event between start date and end date.
Our component is designed to be extensible. To make it look like it does in the video, you'd have tocreate a custom dayRenderer to displays and styles your data elements.
You can check our documentation for information on the APIs and how to modify, or replace, our default look::
It's not trivial, but it shouldn't be hard either. We'd be more than willing to work with you as a customer to make it work.
Feel free to contact us directly if you wanted to discuss further ( http://www.flextras.com/?event=ContactForm )
Any Help please?