Programmatically generating assertions.

Okay this is an issue I am have trouble figuring out on my own.

I am attempting to Programmatically add an assertion and the problem I am running into is that when I open the AddAssertionPanel for a RestTestRequestStep, Valid and Invalid HTTP Status Codes are disabled as a selectable option. Running the same library with the UI, these options are available. Could someone please help me to understand why this is happening?

My code is as Follows:

         public static Object addAssertionToTestStep(WsdlTestStep teststep) {
        if (!(teststep instanceof Assertable))
          return null;
        else {
                Assertable a = (Assertable) teststep;   
          Map<String, TestAssertionFactory> map = getAssertionFactories();
          final AddAssertionPanel addAssertionPanel = new AddAssertionPanel( a );
          addAssertionPanel.setVisible(true);
                return null;
            }
         }

If anyone knows the answer it would be much appreciated if you could share.