public override bool SetMargins(float left, float right, float top, float bottom) {
rtfDoc.GetDocumentHeader().GetPageSetting().SetMarginLeft((int) (left * RtfElement.TWIPS_FACTOR));
rtfDoc.GetDocumentHeader().GetPageSetting().SetMarginRight((int) (right * RtfElement.TWIPS_FACTOR));
rtfDoc.GetDocumentHeader().GetPageSetting().SetMarginTop((int) (top * RtfElement.TWIPS_FACTOR));
rtfDoc.GetDocumentHeader().GetPageSetting().SetMarginBottom((int) (bottom * RtfElement.TWIPS_FACTOR));
return true;
}