Hi Nathalie,
Just to add some thoughts...
Have you tried using nested repeater (listing control), e.g. like described in
Controls reference docs.?
You could list all news under each section by a nested control. It would be helpful to see the structure in the content tree and transformations you're using. How is the content ("This is an...") rendered in transformation?
Anyway, good to hear the User Control works fine for your purpose.
Regards,
Zdenek