How to return a value from Controller methods

I have this:

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1. $.Controller.extend("TestController",
2.         /* @static */
3.         {
4.             defaults: {
5.      
6.             }
7.         },
8.         /* @prototype */
9.         {
10.                  
11.              /* *** SOME STUFF *** */
12. 
    
13.               returnValue: function() {
14.                         alert("hi");
    
15.                         return 10;
16.               }  
17.         }
18. );

I create this controller on an element and then try to call the "returnValue" method in order to get a value like this:

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1. $("#test").test_controller("returnValue")

 I know it fires because I get the alert, but the only thing that is returned is a reference to the controller element object:

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1. [div#test.test_controller]

How do I get the return value?