method Chart.Undo ()
Performs the last Undo operation.

TypeDescription
Call the Undo method to Undo the last chart operation. The Undo method have effect only if the AllowUndoRedo property is True. The CTRL+Z performs the last undo operation, while the CTRL+Y redoes the next action in the chart's Redo queue. The Redo redoes the next action in the chart's redo queue.  The CanUndo property retrieves a value that indicates whether the chart may perform the last Undo operation. The CanRedo property retrieves a value that specifies whether the chart can execute the next operation in the chart's Redo queue. The ChartStartChanging(exUndo/exRedo) / ChartEndChanging(exUndo/exRedo) event notifies your application whenever an Undo/Redo operation is performed. 

The records of the Undo/Redo queue may contain actions in the following format:

The records of the Undo/Redo queue may contain actions in the following format (available starting from 23.0):

Also, the Undo/Redo queue may include:

The UndoListAction property lists the Undo actions that can be performed in the chart. Use the UndoRemoveAction method to remove the last actions from the undo queue.