add a column dynamically with values in datatable

Hi all,
the following example add a new column, now how fill it with values?

https://docs.webix.com/samples/15_datatable/09_columns/04_add_column.html

I tried this:
record = grid.getItem(row_id);
record[column_name] = new_value;
grid.refresh();
//or
grid.updateItem(row_id, record);

but is not working
Thanks

Hello,

As far as I can see, everything works smoothly: https://webix.com/snippet/814ad6d9

Thank you Helga