NPOI 設置圖片坐標未起到作用

cell = sheet1.GetRow(Tisrow).GetCell( Tiscell);
// ?置?片所在?元格的行和列索引
int rowIndex = Tisrow;
int colIndex = Tiscell;

                                // ?建???象，并?置?片在?元格中的位置和大小
                                IClientAnchor anchor = drawing.CreateAnchor(900, 64, 900, 64, colIndex, rowIndex, colIndex + 1, rowIndex + 1);
                                //anchor.AnchorType = AnchorType.MoveDontResize;
                                // ?建 Picture ?象，并?其添加到???中
                                IPicture picture = drawing.CreatePicture(anchor, pictureIndex1);
                                picture.Resize();