I have witten a simplified (in my opinion anyway) plotting routine, but would like to add a 'Plot Preview' button to my dialog. It appears that Plot Preview takes all the values it needs to produce a preview from the native AutoCAD Plot data, but I was wondering if it were possible to update these values 'behind the scenes' so that the preview takes on my values, and am hoping that someone could tell me how to access them or where they are? Thanks Peter