hierarchical lists with collapsing arrows

[Xeubie Tsu]

I'm attempting to make a list field that can organize context into 
"folders." I want an arrow icon next to folder names that you can click to 
collapse the folder. One way to get the arrow icon next to the text is to 
use "imagesource," but doing so makes it PART of the list field itself so 
you can't click on it (you can only click the whole list item).

Does anyone know an easy way to do this? I also tried making an arrow with 
rev's graphics tools, but you apparently can't embed rev graphics into list 
fields - only images!

Thanks very much,
Oakes

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