As a school district, we would like to be able to use Semester and Quarters as a period of time.  However, these obviously do not follow the conventional calendars.  So it would be nice for the TimeBar control to have databound "terms"  or "groupings" of time.  Having already stored the Academic Year, Terms and School Days in 3 different tables, it would be nice to use those same data points to construct the timebar.

We are unsure how we would like to display dates not inside of the academic year, as well as non-school days.

Example:  

Our current academic year is as follows:
Aug 18, 2010 - May 27, 2011


Our current terms are as follows:
Semester 1 
Aug 18,2010 - Jan 7, 2011

Semester 2
Jan 11, 2011 - May 27, 2011

(We have quarters at our elementary schools, but for the sake of this example, we'll stick with our High School, which has 2 terms.)

One of the things we would like to use this timeline for is for daily attendance.  It would be really nice to see the sparkline graph with the overall attendance rate for each day and then slide the window for the range the user would like to view more details on.  Then based on the selected range, a more detailed breakdown of attendance would display for the different subgroups (gender, grade level, ethnicity, etc.)  

Now for the point of this, it would be nice to limit only to the actual school days, as attendance does not make sense for non-attendance days.  If we were to use this for discipline incidents though, it would be nice to also include the non-school days in the term.  The reason for this would be high school student do get in trouble at the weekend sporting events, which the date of occurance would not be a school day.

ADMIN:
We are closing this item because the RadTimeBar now supports Custom Interval Types. You can read about this feature here
http://docs.telerik.com/devtools/wpf/controls/radtimebar/features/custom-interval-types.html
If you need irregular (interrupted) time periods, you can submit a new feature request. 

The System.Globalization namespace includes the following Calendar implementations: GregorianCalendar, HebrewCalendar, HijriCalendar, JapaneseCalendar, JulianCalendar, KoreanCalendar, TaiwanCalendar, and ThaiBuddhistCalendar. 

Consider implementing support for custom calendar in RadTimeline and RadTimeBar controls.

InvalidOperationException when changing the selection in case the timeBar is in a floating RadSplitContainer and browser zoom is not 100%.

Introduce ability for hiding GroupControl and ItemControl for scenarios, where only Items or Groups are needed.