Hey, Gerard,

You need to do a couple of things...

First, you need to bind to the Checked property of the checkbox, like so...

System.Windows.Forms.Binding chkBinding;
chkBinding = new System.Windows.Forms.Binding("Checked",
				MyDataSet  , "MyTable.MyFlag");

chkBinding.Format += new ConvertEventHandler(this.CheckBoxHandler);
chkEmployee.DataBindings.Add(chkBinding);

Note the reference to "CheckBoxHandler"...it's there to handle null values...

private void CheckBoxHandler(object sender, ConvertEventArgs e)
{
    if (e.Value == DBNull.Value)
     e.Value = false;
}

Let me know if that helps...
Kevin