Barrie's last involvement with stage production

[Carrie]

Hello all:
It's been a while since I've been on the forum, and I'm delighted be diving back into some of my research on Barrie and Peter Pan.

I was hoping that someone could help me determine when Barrie stopped actively participating in the stage production of _Peter Pan; or, the Boy Who Would Not Grow Up_. Hanson mentions some modifications that Barrie made to the production starring Jean Forbes-Robertson, but I don't see any later mentions. Does anyone know when/why he stopped taking an active role?

My apologies if this is answered in one of the biographies--I'm traveling for the holidays and am away from my usual resources. Thank you for your help!