onDataRequest event is not firing

HI , i m using webix-jet framwork for my application and i m having issue with onDataRequest event in my treeview control.The onDataRequest event is not firing if i define onAfterContextMenu event after it and vice versa.Please check below snippet

https://webix.com/snippet/b9809057

Hello!
You can load levels dynamically, and it can be done with or without onDataRequest event.

Normally, when you are loading data you can mark some nodes with <a href = 'http://docs.webix.com/datatree__data_formats.html#expecteddataformats'>webix_kids</a> attribute

Such nodes will be rendered as “folders” and during opening will try to load extra data ( data loading will trigger onDataRequest )
Here is an example: https://webix.com/snippet/882ea737

@Nastja thanks a lot it works as i want