How do I hide particular checkboxes in a datagrid column?

Hi, I have a DataGrid bound to a table with 5 columns and 20 rows. Out of 5 columns, the first one is of custom type public class DataGridCheckBoxColumn : DataGridBoolColumn {}; the rest 4 columns are of type DataGridTextBoxColumn. My first column needs to be able to hide checkboxes based on the rowNum. I was able to make them uneditable by overriding the Edit()method, but how do I make them invisible? I tried overriding Paint() method, but it didn't work for me: protected override void Paint(Graphics g, Rectangle bounds, CurrencyManager source, int rowNum, bool alignToRight) { if (rowNum == 1) { Brush bgBrush = new SolidBrush(this.DataGridTableStyle.BackColor); Brush fgBrush = new SolidBrush(this.DataGridTableStyle.ForeColor); g.FillRectangle (bgBrush, bounds); } else base.Paint(g, bounds, source, rowNum, alignToRight); } I would appreciate any suggestions on how I might be able to hide/make invisible certain checkboxes. Thanks so much! Natalia