[Do I need to call .load() method multiple times]

I am trying to use LoaderMax API, in an existing application. To replace all http calls with LoaderMax, I have written a Singleton class, which keeps an instance of LoaderMax object. Now, in my application, wherever a http request is needed, I get an instance of single LoaderMax object and append to the queue, with a callback handler. My question, do I need to call the .load method everytime, I append a URL, or LoaderMax looks internally for the queue length? 

[How to get loader url in progress handler]

I am trying to get url in progresshandler. I tried typecasting event.target to LoaderItem, but it doesn't seem to work. event.target is of type LoaderMax. How can I get the currently loading item's url in progress handler ?

 

Please help..