Object that contains data about the control.
Object.defineProperty(ImageViewer.prototype, 'tag',
get: function(),
set: function(value)
)
tag: any;
An object that contains data about the control. Default value is null.
Any value can be assigned to this property and is not used by the ImageViewer.
A common use for the Tag property is to store data that is closely associated with the viewer. For example, if you have a viewer that displays information from a database, you might the ID of the data item in the viewer's Tag property so that it can be referenced quickly from other parts of the application.
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