Hi i have a problem with ui.accordion, here the example
http://webix.com/snippet/004ff3ec
i hade set the ui.accordion property multy=“false” but if i have 2 accordion items visible, i can collapse them both. Help pls 
Accordion expands the next panel, in your case the next hidden panel.
It is a bug of course, hidden panels must be ignored.
Will be fixed in the next build.
Ok thanks very much!