than in its own layer.
         * @attribute inlineMenu
         * @type boolean
         */
        inlineMenu: false,

        /**
         * Horizontally align the overlay with the button.
         * @attribute halign
         * @type string
         */
        halign: 'left',

        /**
         * Display the overlay on top or below the button.
         * @attribute valign
         * @type string
         */
        valign: 'top',

        /**
         * If true, the selection will persist when the me