How to draw into a canvas that has a set backdrop

I am am setting a canvas with a picture using “canvas1.backdrop = picture” and I was wondering, is there any way I can access the graphics property of the canvas to draw a rectangle on top of the picture? when I try to do “Canvas1.Backdrop.Graphics.DrawRect 23,156,231,44” i get a nil object exception…

Canvas1.Graphics.DrawRect 23,156,231,44

in the canvas paint event/method you can draw over the background.
you could also use the picture.Graphics to draw something before you assign the image as backdrop.

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You cant do that in any recent recent version of Xojo
You must use g.DrawRect 23,156,231,44 in the paint event.

You can do 23,156,231,44


canvas1.backdrop = picture

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