I was able to create GtkImage objects in the 3x3 matrix with the path information in the pixbuf property. However, when I run the acquisition scenario, I see the 3x3 matrix with my images on the screen, but the rows and columns of the matrix do not flash.
What further changes do I need to make here?
I'm sorry, I made a mistake when I proposed this solution, because I hadn't think to this problem. This solution is more difficult that I explained.
The letter's flash is represented by a changement of the background and foreground colors, but with a picture, the background is hided by it and the foreground color can't be changed, that's why you didn't see the flash. The problem is, you can't use the same solution as the "magic card" because the "speller" can't replace a GtkImage by an other.
You can try to fix the size of “even box” to have a picture smaller than the "even box" and change the color of the flash, to see it better.
With this solution, you will see your picture with a border corresponding to your flash, when the line or column will be flash. But I think the flash stay discrete, that's why I'm not sure this solution give a good result.
If you can, the best is to keep the letter's system otherwise if this solution have a bad result, you'll need to make a new box inspired by the "speller" and the "magic card".
I hope this help and I'm interested by your feedback.