From the article - some selective quoting:
Lazarus include the property '''columns''' [..] used to add custom columns. Custom columns are fixed column objects that '''replace''' the standard non-fixed grid columns.
So there are the following types of column:
- normal columns: non-fixed
- grid.columns:a sort of fixed column object that is custom
- grid.fixedcols: presumably some other kind of fixed column
Does this seem about right?