 {
 	public function ColumnStatistics(column:IAttributeColumn)
 	{
+		registerDisposableChild(column, this);
 		this.column = column;
 	}
 	

		}
	}
}
import weave.api.data.IColumnWrapper;
import weave.api.data.IStatisticsCache;
import weave.api.registerLinkableChild;
import weave.core.SessionManager;


{
	public function ColumnStatisticsWrapper(columnWrapper:IColumnWrapper, statsCache:IStatisticsCache)
	{
		registerDisposableChild(columnWrapper, this);
		this.columnWrapper = columnWrapper;
		this.statsCache = statsCache;
		columnWrapper.addImmediateCallback(this, getStats);
