Message from TabPanel when a tab is closed?

Hi all,
I have a custom Tab Panel class that inherits from/extends TabPanel.
Is there any method that I can override that gets called when a closable tab is closed?

I tried overriding the method protected onChildRemoved(msg: Widget.ChildMessage): void;
but that method doesnt get called when a tab is closed.

Widget.onCloseRequest should be called on close. By default it delegates to dispose method.