getGroupHandle( container ).setKeyExpr( DEUtil.getExpression( dataSetColumn ) );
getGroupHandle( container ).setKeyExpr( DEUtil.getColumnExpression( dataSetColumn.getColumnName( ) ) );
		public void insert( Object object ) throws SemanticException		{			Assert.isTrue( object instanceof ResultSetColumnHandle );			Assert.isTrue( object == dataSetColumn || object == null );			getGroupContainer( container ).setDataSet( getDataSetHandle( dataSetColumn ) );			getGroupHandle( container ).setKeyExpr( DEUtil.getExpression( dataSetColumn ) );		}