The resize (splitter) controls would be used to select (get) the time space which they wrap. For example please refer the attached screenshot.

Render the TimeRuler of the two specific days during the year in DayViewDefinition in the following way:

When setting back the clock:

00:00
01:00
02:00
(02:00)
03:00
04:00
...

And when setting it forward it would be:

00:00
01:00
03:00
04:00
...

When a time line view is used with resource descriptors and a single resource contains multiple appointments ScrollIntoView scrolls to the wrong position. The resource slot is scrolled in the view but the appointment is not in view when the slot is large.

Attached is a sample project demonstrating the problem.

When the appointment is in the AllDayArea and it ends at the CurrentDate and the DayStartTime and DayEndTime are set, the arrow for continuance is still shown.

Reproducible in the latest demo.

Create daily recurrence. Select multiple occurrences and drag them. For the first time they will be dragged. Then select exceptional (this is important!) occurrences and drag them - only the occurrence which was selected first will be dragged.

When the appointment is few days long and the IsAllDayEvent is Not set, the appointment is rendered on the previous day. The DayStartTime should also be set to something different then 0:00h.

In current implementation if the Appointment starts before the DayStartTime its not possible to scroll to it using ScrollIntoView method.

Like the  EnableSmallAppointmentRendering property of the DayViewDefinition/WeekViewDefinition.

Add ability to display arrows to the scheduleview when there are appointments outside the visible area
http://www.telerik.com/community/forums/wpf/scheduleview/mark-to-see-items-out-of-visible-range.aspx

Implement a way to hide weekends from MonthView

I know that there is few properties which can be stored into database (start time, end time, subject).
My main goal is to store priority and  timemarker data also but it seems there is no way to get them.
I've noticed that if time marker is added into appo

When creating an recurrent appointment on the 31st of the month Outlook gives the user a warning: "Some months have fewer than 31 days. For these months, the occurrence will fall on the last day of the month."  And as the message indicates, the event occurrences would start on the last day of the month when the 31st does not exist. 

This will set the occurrences at the end of each month regardless of the length of the month.

Currently it is possible to set only fixed width to the GroupHeaders.