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How can I create the "title collapsiblock" class?

Project:Advanced Book Blocks
Version:6.x-1.9
Component:Miscellaneous
Category:task
Priority:major
Assigned:amirtaiar
Status:active

Issue Summary

I have tried to follow the document but I couldn't figure this out.
I have create a menubook:
title of the block
- 1
--1.2
--1.3
--1.4
In the document page the title is part of the collaps block. How did they establidh this?
Thank's
Amir

nobody click here