Because this behavior is implemented internally in the control it is not possible to workaround it or change it. You can use our feedback portal in order to add any bug reports, feature requests or general feedback for the Telerik WPF and Silverlight controls. The portal can be found here
By design in the TimelineViewDefinition appointments with the same length are positioned vertically according to their subject in alphabetic order. For example if you have three appointments with subjects set to "Appointment 1", 2 and 3 they will be order vertically starting from Appointment 1 then Appointment 2 and finally Appointment 3. Hope this information make it more clear how appointments are positioned in that ViewDefinition.
TRY TELERIK'S NEWEST PRODUCT - EQATEC APPLICATION ANALYTICS for WPF.
Learn what features your users use (or don't use) in your application. Know your audience. Target it better. Develop wisely.
Sign up for Free application insights >>