CenterParent for a non-Modal Form in C#

I'm using a non-modal form to display a progress/busy/working dialog while a form is busy doing something. Unfortunately, the StartPosition=CenterParent, which works fine via Form.ShowDialog(), doesn't seem to work when a form is display via Form.Show(). I get around this by centering the form in the form_load method via:

        private void frmBusy_Load(object sender, EventArgs e)
        {
            // centerparent not workin for a ".Show" form, 
            // so set position manually.
            this.Location = new System.Drawing.Point(
                this.Owner.Location.X + 
                 (this.Owner.Width - this.Width) / 2, 
                this.Owner.Location.Y + 
                 (this.Owner.Height - this.Height) / 2);
        }