Combo co Editor Cells

I have a tree grid in which one of the columns is defined as using the co cell editor. All of my other columns are ro (read only). Is there some technique or way to make this one column appear editable to an end user?

Actually “co” column is editable. Please check example here dhtmlx.com/docs/products/dht … combo.html

Thank you for your response. I do realize that it is editable. What I am wondering is if there is a goo or accepted way to indicate that a cell value is editable. I am not sure otherwise how the user would know which cells are and which ones are not editable.