A seatback assembly includes a seatback frame with an airbag deployment system coupled to a side member thereof. The airbag deployment system includes an airbag configured to deploy outwardly at a deployment force. A back panel includes a side member that at least partially covers the airbag deployment system in assembly. The side member includes a notch disposed adjacent to the airbag deployment system which separates a rear portion of the back panel from an airbag door configured to outwardly flex to an open position under the deployment force of the airbag deployment system. An adhesive patch is partially disposed over the notch and includes an adhesive layer adhered to the rear portion of the back panel and the airbag door of the back panel to tether the airbag door to the back panel and control the opening of the airbag door under the deployment force of the airbag.