replacement of document.getElementById( ) in webix?

Hi,

I have a html textbox/ am using document.getElementById( ) to get the value of a tetxbox.

How to achieve it in webix?

Note. I am not creating webix textbox here. its a html text box?

webix itself uses native document.getElementById(…)

https://docs.webix.com/api___tonode.html

Thank you Jacek