ActiveX: Events not available on IE11
On Internet Explorer < v11, event listeners can added with attachEvent(), but on IE11 attachEvent() is not longer available, it will not work.
The alternative method addEventLister() does not work, too, but for all versions of IE.
The last alternative method, which I have found in the documentation of the webplugin, does not work, too:
// DOM level 0
vlc["on" + event] = handler;
This method will not work for IE and other browsers, like Firefox.
Ultimately, this means that there is currently no way to add an event listener on IE11.