set rasterimage to the back via vba

hello everybody,i use the following code to load an display a rasterimage:set rasterImg = ActiveDocument.ModelSpace(sImageName, insPoint, 1, 0)call rasterImg.ScaleEntity(insPoint, dScale)...the image is displayed correctly but in front of the rest of the image.can anybody tell me how to move the image to the back via vba?thanks a lothelmut