- [x] System.ComponentModel.Design.UndoEngine - [x] System.ComponentModel.Design.DesignSurface - [x] System.ComponentModel.Design.InheritanceService - [x] System.ComponentModel.Design.DesignerActionMethodItem - [x] System.ComponentModel.Design.DesignerActionPropertyItem Related requests: #221 #469 Track PR progress: #606