AjaxEventBehavior should not lower-case the event name

I'm using the Bootstrap DatePicker js library (also included in wicket-boostrap)
doc: http://bootstrap-datepicker.readthedocs.org/

I extended AjaxEventBehavior to implement Bootstrap-DataPicker's 'changeDate' event.

my first attempted failed. My AjaxEventBehavior was never triggered. after further investigation I discovered that the event name was all in lowercase! (which prevented latest chrome to trigger it)

Wicket.Ajax.ajax({"u":"./?2-2.IBehaviorListener.0-calendarLink","c":"calendarLink6","dep":[function(attrs){return [

{'name':'newDate', 'value': attrs.event.format()}

]}],"e":"changedate"});;

the getEvent method in AjaxEventBehavior is lowercase the event name!

public String getEvent()
{
String events = event.toLowerCase();

for my case, I just overridden the getEvent to make it work.

I couldn't find a clear description/specification related to case-sensitive or case-insensitive!
one possible hint https://en.wikipedia.org/wiki/DOM_events under Event object:
DOMString (type): The name of the event (case-insensitive in DOM level 2 but case-sensitive in DOM level 3).

should
String events = event.toLowerCase()
be removed?

and Martin Grigorov added the following comment
http://www.w3.org/TR/DOM-Level-3-Events/ confirms what you say.