Can someone please explain how to use ex:iconKey correctly?

I am trying to get custom icons to work with Exhibit + Timeline. The data 
is coming as JSON from Google Docs, where I have an {icon} field which 
contains the URL for each event icon (these are single events). So I am 
trying to  do something like:

<div ex:role="view"
>                 ex:viewClass="Timeline"
>                 ex:start=".start"
>                 ex:end=".end"
>                 ex:iconKey=".icon"
>                 ex:timelineConstructor="myTimelineConstructor"
>                 >
> </div>
>

And myTimelineConstructor makes bands like this:

var bandInfos = [
>                 Timeline.createBandInfo({
>                     width:          "20%", 
>                     intervalUnit:   Timeline.DateTime.MONTH, 
>                     intervalPixels: 100,
>                     eventSource:    
> constructFilteredEventSource(eventSource, window.database, "category", "a"),
>                     theme:          theme
>

Everything works except the icons! Any help would be appreciated. 


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