Refresh Datagrid with Hierarchical Data

how can I refresh the displayed data in a Datagrid when the underlying ArrayCollection changes?

<nmoschitz:dataProvider>
    <mx:HierarchicalData source="{arrCol_groupedData}"
         childrenField="accounts"/>
</nmoschitz:dataProvider>

Calling a simple refresh (like with a simple arraycollection as a dataprovider, or with a refresh on the Grouping Collection) does not work. Also re-assigning the arrayCollection to the Hierarchical Data and then assigning this one again to the Datagrid does not work (even with calling invalidateProperties() or valida开发者_如何学运维teNow()).

Any ideas? Someone suggested to extend HierarchicalData and throw a manual change event, but that seems very akward to me.

Thanks, Martin

---

You could try refreshing the arrayCollection and then calling invalidateList() on the grid

---

I reassigned the whole hierarchical data to the datagrid. However, only the arraycollection needs to be reassigned to the hierarchical data. This solves the issue.

---

You can extend HierarchicalData and override the source property setter to throw a CollectionChange event:

package mypackage
{
import mx.collections.HierarchicalData;
import mx.events.CollectionEvent;
import mx.events.CollectionEventKind;

public class ModifiedHierarchicalData extends HierarchicalData
{
override public function set source(value:Object):void
{
super.source = value;
var event:CollectionEvent =
new CollectionEvent(CollectionEvent.COLLECTION_CHANGE) ;
event.kind = CollectionEventKind.RESET;
dispatchEvent(event);
}
}
}

---

Just expand the root node and close again programmatically will refresh the UI.

                   if(!dGGrid.isItemOpen(itemData)){
                        dGGrid.expandItem(itemData,true);
                        dGGrid.expandItem(itemData,false)
                    }else{
                        dGGrid.expandItem(itemData,false);
                        dGGrid.expandItem(itemData,true);
                    }