A custom object implementing IAnnotation can be added to an UltraChart's Annotations collection, and thus be rendered on a chart like any other type of annotation object.
Alternatively, an IAnnotation object's RenderAnnotation method can be called from a custom layer, which would cause it to be rendered to the SceneGraph using the specified parameters for location.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2