Hiding and showing accordion sections
To switch between different accordion sections just issue a select action on the section:
Lianja.showDocument("page:mypagename.mysection?action=select")
Hiding and showing Accordion Stack sections
An accordion stack is a group of sections where only one section from the accordion is visible at a time but no headers are visible. Check the Stacked behavior at runtime page attribute to specify that the sections should be displayed as an accordion stack. This is typically used in conjunction with a navigation panel but may be used independently to provide you with the ability to switch between the sections contained within a page arranged as an accordion.
Lianja.showDocument("page:mypagename.mysection?action=select")
https://www.lianja.com/doc/index.php/Understanding_Lianja_UI_Navigation