Represents the base class for annotation layer types. Annotations will usually disable some of the default hover/touch behaviors of the chart when they are introduced to the series collection. In return they provide some valuable information as the cursor is moved by hovering over the chart, or performing a press-hold-drag interaction in touch mode.
Target Platforms: Android 4.4+, iOS 8+
Development Environments: Visual Studio 2015+, Visual Studio for Mac Preview, Xamarin for Visual Studio 4.2+