We have tried Johannes solution with a "right click on object, choose Print, then save the image from the popup window".
The first option is to save the object in HTML. It not what we want.
An other option is to save the document as a PDF document. But with this option, object layout is far from what is showing in Ajax : background color and some cells line (with null value) have disappear. Is there any other solution to solve this request ?
Even "the copy image to clipbord" option is not avaible !
As final result, we need a picture in jpeg format, with same color, font...