How to pass event objects as parameters (from handlebars template to an action in a controller)

I am new to ember, thus I would appreciate your assistance. I want to pass an focus-out event (see bold marked text below) from my handlebars template:

To my action in my controller:

   ccFocusLost : function(**event**) {
        alert(event.relatedTarget.tagName);
    },

However, i get an undefined when I do as above. I need a way to obtain the focus-out event in order to find out which element will receive the focus after my main element loses it.

Thanks in advance!