>That's a great idea, however, it's not applicable in my case. I don't want to set all columns ReadOnly, I'd like to set only couple of them (which held building properties). That's why I had this problem. Anyway, I already added one additional line of code for this new column. It works, and that's really matter...

You could let your grid class have a property cfixcolumns that you could use to indicate which columns must me readonly, like this:

cfixcolumns = "1;3;4;8"

Jims' approach could then take this info into account when seting the readonly property of each column.