I took a look onto your example Bruno.
I think what the postopener will be missing, is the following one…
If he clicks the item, the image should display permanently.
The last selected pic (single-mode-selection) do not stay permanently, after it has been chosen.
Of course this is just an example! So the post-opener will still have to do some work on it to get the right functionality. There is also a little white-gap between Image-Switch, which also has to be fixed → perhaps with a smooth fade-in/fade-out after img-src has been loaded.
@ Bruno Prado → Also pay attention on this one…
Since I can’t use RadioButtonGroup then my only alternative seems to be to build my own version using checkboxes aligned like a radioButtonGroup with controls to ensure only one item can be selected
It seems that break80 wanted to achieve a functionality where the user is able to choose ALWAYS JUST ONE PIC AT ONCE , if i understood it the right way (but perhaps i missunderstood something).
No multi-selection should be possible.
I asume, this is why break80 wanted to use → Radiabuttons.
And this is why i suggested → DISABLING immediately selected CHECKBOX after checking.
Bruno i know you can do it better 
.
However, it is a good start!