Enable SaveAction from the Properties TopComponent

Thanks a lot for the quick response and for the link.

Define my own Properties TopComponent using PropertySheet & Lookup seems to be an easy solution.
If I understood correctly this custom implementation retrieves the Lookup of the active TC (excepted itself) and then is able to activate the actions which is exactly the behaviour I'm looking for :)

Why the NbSheet doesn't do the same? Is there a technical reason or limitation that I should be aware?

Thanks again for your help ;)
Yann