Home / API Reference / StockSharp.Diagram IUndoManager StockSharp.Diagram Undo/redo manager. Properties IsUndoingRedoing : bool This property is during a call to Undo or Redo. Methods CanRedo() : bool Can redo. Returns: Check result. CanUndo() : bool Can undo. Returns: Check result. Redo() Redo. Undo() Undo.