Print to PDF using vba/intellicad but problem with centeronpage and scale

Hi,I have been able to print to a pdf file using Adobe PDF writer using File/Print menu options and from within vb. However, when I use the File/Print method and I have the Center On Page checked, and the scale set to 0'-1"=0'-1", the dwg is plotted centered on the page (8.5x11), and scaled to fill the whole page. But from within vb, the dwg is not centered and the dwg is not scaled to the page. I checked the scale from within vb and it is the same as the setting from the File/Print menu. Has anyone any suggestions that may resolve this problem? Has anyone an idea of valid values for PlotManager.CenterOnPage?