Load items when they come into view Flexbox

Question

I have a flexbox and i have slides inside it. As the number of slides is unknown and to help with performance i want to load each slides content when it comes into view.

Now i can do this on a website using the jquery plugin appear but for some unknown reason in windows 8 winJS it only ever load the first slide and is never fired for any other slide.

Now is there a reason why this is only fired once? is there a winJS function to allow me to "lazy load" content?

This is the jquery plugin im trying to use: https://github.com/bas2k/jquery.appear

Help ASAP please.