Dynamically add button column to DataGrid

[herman404]

Hi everyone, I'm trying to dynamically add 3 button columns to a
DataGrid object that I have on an ASP.net webpage, but I don't see any
documentation on how to do it. I've seen plenty of examples on how to
add regular columns, but how do you declare a button column? My code is
posted below, I have a placeholder on a webform, and the datagrid will
be added on the placeholder once it is initalised. Thanks!

System.Web.UI.W ebControls.Labe l lblNoRecords = new
System.Web.UI.W ebControls.Labe l();

clsResults objResults = new clsResults();

objResults.Sour ceWebPage = this;
objResults.SQLS tring = sSQLString;

// Set datagrid reference to returned results
this.dgTable = objResults.Data Grid;

// Add button columns to datagrid
DataColumn editButton = ???
DataColumn updateButton = ???
DataColumn cancelButton = ???
// Add event handlers
this.dgTable.Ed itCommand += new
DataGridCommand EventHandler(dg Table_EditComma nd);
this.dgTable.Ca ncelCommand += new
DataGridCommand EventHandler(dg Table_CancelCom mand);
this.dgTable.Up dateCommand += new
DataGridCommand EventHandler(dg Table_UpdateCom mand);

// Add datagrid to webform
//PlaceHolder1.Co ntrols.Add(objR esults.DataGrid );
this.PlaceHolde r1.Controls.Add (this.dgTable);

if (objResults.Rec ordsRetrieved == 0)
{
lblNoRecords.Te xt = "No records retrieved from database";
lblNoRecords.Cs sClass = "norecordsText" ;
PlaceHolder1.Co ntrols.Add(lblN oRecords);
}

objResults = null;