How to select an item in s:ComboBox

Question

With the mx:ComboBox setting a selected item from a data source was easy:
<mx:ComboBox dataProvider="{siteDictionary}" value="{getService.lastResult.@idSite}"/>
Where the dictionary is defined as something like this:
[Bindable] public var siteDictionary:ArrayCollection = new ArrayCollection([
   {label:"Site 1", data:'1'},
   {label:"Site 2", data:'2'}]);
And getService returns something like:
<service idSite="2"/>
With spark, I tried this:
<s:ComboBox dataProvider="{siteDictionary}" selectedItem="{getService.lastResult.@idSite}"/>
But obviously it doesn't work, because I just have the id, not the entire object.  This is such a basic task I'm amazed that I could not find any examples on how to do it.  I did find one, where a person set the selectedIndex just by looping through the dataProvider until they found the id.  I REFUSE to accept that is the only way to do this!  Seems like a step backward to me.  Anyone know the right way?

Answer 1

Sorry, didn't notice you were using the value property on mx:ComboBox.
If you're getting back XML, unless you are going to access the data often,
you might be better off leaving it as XML and using XMLListCollection
instead of ArrayCollection.
Then, since you can probably guarantee that the XML query will return one
and only one XML node try:
selectedItem="{XML(getService.lastResult).@idSite[0]}"
If you really have to work with XML converted to objects you'll have to loop
through and find it.  That's what mx:ComboBox did under the covers anyway.