This class represents the overlay text, which is a text string that is shown above the sub-cell.
The text can be either a user entered data, or a built-in interactive text, which get updated according to the changes made to the image in the viewer.
To add the overlay text to the viewer, add an instance of this class to the collection Overlays.
To show or hide the overlay text, use OverlayTextVisible.
Medical Web Viewer .NET