This wraps the ObjectARX AcDbAssocTrimSurfaceActionBody class.

Autodesk.AutoCAD.DatabaseServices.DBObject
    Autodesk.AutoCAD.DatabaseServices.AssocActionBody
        Autodesk.AutoCAD.DatabaseServices.AssocParamBasedActionBody
            Autodesk.AutoCAD.DatabaseServices.AssocSurfaceActionBody
                Autodesk.AutoCAD.DatabaseServices.AssocPathBasedSurfaceActionBody
                    Autodesk.AutoCAD.DatabaseServices.AssocTrimSurfaceActionBody

Public Class AssocTrimSurfaceActionBody
Inherits AssocPathBasedSurfaceActionBody

public class AssocTrimSurfaceActionBody : AssocPathBasedSurfaceActionBody;