ActiveContent in list - button labels disappear

Copy from example: http://webix.com/snippet/2cbcd403 .
if click on button and loose focus label disappear.
http://docs.webix.com/samples/05_list/15_active_content.html in sample similiar behavior.

Hello,

Please use “label” property instead of “value” to set button label.

http://webix.com/snippet/5e8c4a37

We will correct the demo in docs.