When implementing the sample described in http://dev.day.com/docs/en/cq/current/developing/components.html (creating a new component "Text & Image (Extended)" as a copy of existing component "Text & Image") I've got two problems - but will split them to two threads.
First: The published version of my website doesn't show the paragraph added on behalf of "Text & Image (Extended)", but works fine if I use the old "Text & Image"-component. The only reason I can think of is that the new component needs to be known at publisher site; but until yet I did not find any hint according to this problem.
brgds,
Ulrich