After a few more hours of debugging I discovered that the URLBuilder
solution that I mentioned previously does
not work because there is no service provider after I move from design mode
to HTML mode and back.
The article below gives me a possible solution. I will try it tomorrow
However, can anyone give me an explanation why there would not be a service
provider after this switch?? The fact the one does not exist makes me
understand why the ImageUrlEditor is not working.