   ###
   toggle: ->
     if @shown
-      goog.dom.classes.remove @toggleElement, wzk.ui.popup.Popup.CLS.HIDDEN
+      goog.dom.classes.add @element, wzk.ui.popup.Popup.CLS.OPEN
     else
-      goog.dom.classes.add @toggleElement, wzk.ui.popup.Popup.CLS.HIDDEN
+      goog.dom.classes.remove @element, wzk.ui.popup.Popup.CLS.OPEN

    goog.events.listen element, goog.events.EventType.TOUCHSTART, @handleToggle
    goog.events.listen @dom.one('body'), goog.events.EventType.TOUCHSTART, @handleClose

    super(element)

  ###*
    @protected

    @enum {string}
  ###
  @CLS:
    OPEN: 'open'

  ###*
    @param {Object} params
