private void btnRemoveUser_Click(object sender, EventArgs e)
        {
            btnRemoveUser.DisableServerSideValidation();

            if (Page.IsValid)
            {
                // Remove this planner from this traffic area.
                int  identityId = Convert.ToInt32(cboTrafficAreaUsers.SelectedValue);
                bool success    = false;

                using (Facade.ITrafficArea facTrafficArea = new Facade.Traffic())
                    success = facTrafficArea.DeleteUser(m_trafficArea.TrafficAreaId, identityId, ((Entities.CustomPrincipal)Page.User).UserName);

                if (success)
                {
                    lblConfirmation.Text = "The planner is no longer attached to the traffic area.";
                    ConfigureTrafficAreaManupulation(eTrafficAreaManipulation.ConfigurePlanners);
                }
                else
                {
                    lblConfirmation.Text = "The planner could not be removed from the traffic area.";
                }

                lblConfirmation.Visible = true;
            }
        }