The Step Progressor used by the layer to show progress on actions such as drawing.
[Visual Basic 6.0] Property StepProgressor As IStepProgressor
[Visual Basic .NET]
Public WriteOnly Property StepProgressor
[C#] public void StepProgressor {set;}
[Java] public IStepProgressor setStepProgressor() throws IOException, AutomationException
[C++] HRESULT put_StepProgressor( IStepProgressor* );