Can I show a spinner when the images are loading

I am now using flash builder 4.5.1 to create a mobile application. there will be multiple images in the view. I want to use  a spinner to indicate the image is loading, and once the image loaded,  the content of each image be replaced by the original mobimage.
1) For IconItemRenderer, how to show the spinner?
2) For the Image control, how to show the spinner?
Thanks and hope you can understand my question and also hope some people can answer me.

Is working on FCE projects while all the video files are saved on an external drive a bad idea?
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