Showing ROI in a ImageCanvas

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Showing ROI in a ImageCanvas

Protonsx22
Hello everybody.

I am using imagej lib to programm, I need a automatic roi into a image and if it is ok to the user he push ok and the software will process the image.

Thats ok, but I cant see a roi in my image, that is what I have done:
ImagePlus img = IJ.openImage("myImage.jpg")
Roi roi = new Roi(10, 10, img); //10x10 is just a test
img.setRoi(roi);
ImageCanvas canvas = new ImageCanvas(img);

//after that I added the canvas to my frame:
this.add(canvas);

Well, I only can see the image, I cant see the square roi into it
I´ve making something wrong, but why?

Thanks in advance for any tip

bye bye

Jorge