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History
Updated over 6 months ago
RadImageEditor has a history stack, which records each command that is executed on the image currently loaded in the control. This is convenient, as it allows past actions to be reversed and re-applied whenever needed.
Undo/Redo commands can be executed from the UI.

You can use the methods as well.
C#
radImageEditor1.ImageEditorElement.Undo();
//or
radImageEditor1.ImageEditorElement.Redo();