UnityEditor.ProceduralMaterialInspector.OnEnable C# (CSharp) Method

        public override void OnEnable()
        {
            base.OnEnable();
            Undo.undoRedoPerformed = (Undo.UndoRedoCallback) Delegate.Combine(Undo.undoRedoPerformed, new Undo.UndoRedoCallback(this.UndoRedoPerformed));
        }