 import mx.core.mx_internal;
 import mx.events.CollectionEvent;
 import mx.events.CollectionEventKind;
+import mx.events.PropertyChangeEvent;
 import mx.styles.ISimpleStyleClient;
 
 import spark.components.ColumnHeaderBar;

    // out how to migrate data from the old GLC to the new one.
    // Note also: if this was going to be shared, it should arrive as a constructor parameter.
    public var gridDimensions:GridDimensions;
        
    
    public function GridLayout()
    {

                return dataProviderCollectionReset(event);
                
            case CollectionEventKind.UPDATE:
                return dataProviderCollectionUpdate(event);
            case CollectionEventKind.REPLACE:
                break;
        }
