createDelegate = function (oElement) {
			return {
				/**
				 * @this {sap.ui.core.Popup}
				 * @private
				 */
				onBeforeRendering: function() {
					var oDomRef = oElement.getDomRef();
					if (oDomRef && this.isOpen()) {
						oDomRef.removeEventListener("blur", this.fnEventHandler, true);
					}
				},
				/**
				 * @this {sap.ui.core.Popup}
				 * @private
				 */
				onAfterRendering: function() {
					var oDomRef = oElement.getDomRef();
					if (oDomRef && this.isOpen()) {
						oDomRef.addEventListener("blur", this.fnEventHandler, true);
					}
				}
			};
		}
Sets additional content that are considered part of the Popup.

A popup with autoclose {@link #setAutoClose} enabled allows the focus to be moved into the extra content without
closing itself.

A popup with modal {@link #setModal} enabled allows the focus to be shifted into the extra content without taking it
back to the previous focused element in the popup.

@param {Element[]|sap.ui.core.Element[]|string[]} aContent An array containing DOM elements, sap.ui.core.Element
 or an ID which are considered to be part of the Popup; a value of null removes all previous content
@return {this} <code>this</code> to allow method chaining
@public
@since 1.75