This .NET class wraps the AcPlPlotProgress ObjectARX class. 

The PlotProgress interface defines the behaviors that a plot progress dialog must implement. Applications can derive from this class or instantiate a default implementation of a plot progress dialog using acplCreatePlotProgressDialog(). Applications pass the dialog to the PlotEngine, which manages the dialog during the plotting operation.

Autodesk.AutoCAD.PlottingServices.PlotProgress
    Autodesk.AutoCAD.PlottingServices.PlotProgressDialog

Public Class PlotProgress
Inherits DisposableWrapper

public class PlotProgress : DisposableWrapper;