public static function sortOn(key:String, collection:ICollectionView, caseInsensitive:Boolean = false, descending:Boolean = false, numeric:Boolean = false):void
   Sorts an ICollectionView such as ArrayCollection, based on specified 
   item key
   
   
Parameters
 | key:String — A property in which to base the sort
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 | collection:ICollectionView — A collection of items in which the sort is to be applied
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 | caseInsensitive:Boolean (default = false) — specifies if a caseInsensitive sort is to be applied
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 | descending:Boolean (default = false) — specifies if a descending sort is to be applied
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 | numeric:Boolean (default = false) — specifies if a numeric sort is to be applied
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