In your code you have the property <s:itemRenderer> but you don't have the <s:ItemRenderer> class, I added this to your code below.
<mx:Image height="100" width="100" />
Also, if your new to flex a great place to start is Adobes training, check out
To help with what your asking, look at this section:
Displaying data with the DataGroup container
in the above adobe link.
Hope this helps,
Thank you for taking the time to respond to my question, I really appreciate it. I haven't tested the code yet, but that looks about right. I'm probably going to have to write a custom ItemRenderer anyway, as I want the opacity of each thumbnail to change in response to a hover event. Thanks again!
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Glad to be of help James.