how to override Glade editor winndow background

I am trying to make a custom widget that shows an image on a window
and has a fixed widget on top of that so other widgets can be placed
in the appropriate position. It's for a customizable machine operator
panel. This part I can do.

What I can't do is get it to display the image in the GLADE editor.
Of course the editor puts the default background in the window.

Is there away to override this ?

I am programming in python  and using glade 3.6.7

Thanks You.

Chris Morley

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