Forgive me if I missed something, as I made this change months ago, but there doesn't seem to be much new since then.
I was working on a project earlier this year, where I needed the possibility to change a docked panel's title at runtime, and I wanted the title to be udpated in both the tabs, if it was docked, and the titlebar if it was floating. To do so, I added a override Text attribute to the DockContent which on top of updating the base.Text value, it also updates the handler's TabText attribute. Also I made it so that the handler updates the floating window which the tab resides in, if it's in a floating state. I don't know if this is of any interest to you people, but I thought I would share it anyhow.