Using plot and sheet together?

	I have a situation where I have a base canvas, and I want to overlay
both a plot and sheet on it.  Both will be transparent, and they will be
shown at times individually and at times together.  I have the plot
working well, and I know how to have multiple plots on a canvas. 
However, a plot and sheet together is giving me trouble.

	Anybody have some suggestions?  I am currently trying to add the sheet
to the canvas as a custom child, but I have not been able to figure out
how to get the sheet to draw itself in that case.

	What I would *really* like is to add the sheet to the canvas exactly
the same way plots can be added.  Sheets would be well-understood
children of the canvas, like plots are.  However, it appears that a
canvas is only really set up to have either drawings on it as children
(lines, shapes, etc.), or plots as children.

	If anybody has suggestions on using plots and sheets together in the
same window, I'd really like to hear from you -- thanks!!


-- Al




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