The 
                  		  View By group is the list of all files contained in the Code Review. You can use either the 
                  		  Files 
                  		   or 
                  		  Change Sets
 or 
                  		  Change Sets 
                  		   mode to select a file.
 mode to select a file. 
                  		
               
When you select a file in the 
                     		  View By group, the main pane displays the file in 
                     		  Diff mode. You can use the 
                     		  Unified 
                     		   or 
                     		  Side By Side
 or 
                     		  Side By Side 
                     		   view 
                     		  to review and 
                     		  comment on the code.
 view 
                     		  to review and 
                     		  comment on the code.