It was this level of fiddling about that I didn't really want to have
to get into, but I've managed to limit it to the following:

<mx:DataGrid id="grdSummary"
creationComplete="{ArrayCollection(grdDetail.dataProvider).addEventListener(CollectionEvent.COLLECTION_CHANGE,
makeSummary)};makeSummary()"/>


private function makeSummary(event:CollectionEvent = null):void {
        var mCount:uint = 0;
        var iCount:uint = 0;
        var sCount:uint = 0;

        var source:ArrayCollection = grd.dataProvider as ArrayCollection;
        
        for (var i:uint=0; i < source.length; i++) {
                var user:SimpleUser = SimpleUser(source[i]);
                if (user.dept == "Management") {
                        mCount++;
                }
                if (user.dept == "IT") {
                        iCount++;
                }
                if (user.dept == "Support") {
                        sCount++;
                }                                                               
                
        }
        
        var summary:ArrayCollection = new ArrayCollection();
        summary.addItem({Department:'Management', count: mCount});
        summary.addItem({Department:'IT', count: iCount});
        summary.addItem({Department:'Support', count: sCount});

        grdSummary.dataProvider = summary;
}


Thanks for all your help.

David.

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