I have a question about the best way of doing for decrease font size in function of the language used by the operator.
Witch strategy did you use ?
Thanks
Benoît
Hi Benoit,
Since the font size cannot be adjusted via events or bindings, I would recommend an event-based theme switch.
Sincerly Simon 
I was thinking the same, good 
And is it possible to derivate a theme ?
Not directly. However, within a theme’s StyleSet, you can reference Styles files from the other theme.
The styles with the different font sizes are located in separate Styles files. All the others are used in both themes.