The outline properties of the chart series are not respected by most charts.
Value of a cell is visualized outside of the cell boundaries, or the value is clipped and partially visible, when the cell is updated (from code-behind), while being in an inactive worksheet, and is referenced by another cell from the active sheet. Workaround: get a value of some cell in the active sheet and set it again to the same cell. The issue is reproducible after the official release of Q1 2015.
In AgendaView, you can see the start, end, and subject of each appointment. When All Day event is set to one appointment, its start and end time is not changed. The text can be changed to All Day Event.
If the RadTimeline control is placed in a DataTemplate and the ItemTemplateSelector property is set in XAML, the selector is never used.
This is not reproducible if the RadTimeline control is not in a DataTemplate.
To work this around set the ItemTemplateSelector property in code-behind, after the RadTimeline control is initialized. You can use the Loaded event of the control.
The callout gets clipped when the Content property is null and the ContentTemplate is set, as well as the arrow points are set to custom values.
The workaround for this is to set the Content property.