Hi banal,
Your help has been really appreciated, thank you very much for your help.
I didn't want to, but I had to do the jquery solution, since to do the other one is needed to change some javascript file from the core and I don't want to touch any of the core files unless configuration stuff, so I can upload new versions without problems in the future.
Anyway, I think is not right/good to be adding javascript hacks to solve things that should be implemented in a configuration file, it only can bring new problems and misunderstandings, lowering the quality of my code and making it far way less smart ;)
In my point of view it has no sense to be adding one jquery line for each time I have to use some event, I keep thinking there is a problem that should be fixed in the core to make this posible only changing the tinymce template file, of course it's just one opinion.
In any case, thank you very much again for helping us!!
Regards!