How can I order by in SQL server in the following query

CREATE TABLE #TEMP(Group_ID int, Product_ID int, Is_Prime_Product char(10));
INSERT INTO #TEMP VALUES
(1,2,'false'),
(1,1,'true '),
(1,3,'false'),
(1,4,'false'),
(2,3,'false'),
(2,1,'true'),
(2,2,'false'),
(3,2,'false'),
(3,3,'true'),
(3,1,'false');

SELECT Group_ID,Product_ID,Is_Prime_Product 
    FROM #TEMP 
      GROUP BY Group_ID,Product_ID,Is_Prime_Product 
       ORDER BY Group_ID,Is_Prime_Product DESC
--------------------------------------------------
Group_ID	Product_ID	Is_Prime_Product
--------------------------------------------------
1	1	true      
1	2	false     
1	3	false     
1	4	false     
2	1	true      
2	2	false     
2	3	false     
3	3	true      
3	1	false     
3	2	false