Keep a morph on top

> Hi!
> I am trying to write a little morphic application for retrieving datasets from
> images of data plots. I have written a little coordinate system morph that I
> can resize and where I can enter the extreme values. Now I would like to load
> for example an image from a pdf page, move it around so that the graph I need
> is on the screen, but somehow ensure that my coordinate system morph stays on
> top of the image. Is there a way to do this?
>
> Danny
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