hide and show columns

Hi, Can you show me how can i hide and show a column in the ExpandGrid (DataBoundGrid) I manage to hide a column by setting LayoutColumns(string[] layoutcolumns), but in this way the column i want to hide is actually deleted from Internal Column collections... how can i retain the columns in the underlying table but remain itself hidden?

This code this.gridDataBoundGrid1.Model.Cols.Hidden[2] = true; placed at the bottom of FormLoad will hide the first column in each table (2 is because 0 is the header and 1 is the +/-).