Datatable focus on first cell

https://snippet.webix.com/f04a93c7

In the above snippet how can i enable editable property for particular row-cell.
In this snippet focus only “Test” cell when we add new row. (Making First Row First Cell Editable on Adding new row)

Hello!
You can check the info about how to edit specified cell here
Example: https://snippet.webix.com/804cb41e
Information about Datatable editing is here