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Level 4

I have a form with a repeating subform that is first instantiated by a radio button (basically unless the "yes" button is checked the subform shouldn't display).  I have a button to add instances of the subform, and a button to delete instances of the subform, and they work fine.  However, if the last instance of the subform is deleted, I want the value of the radio button to change from "yes" to "no".  The code I've been trying is (in the "click" event)

if Description_Value_Notes_and_Office_Notes.instanceManager.count=0
          Yes_No_Base.rawValue='2';

However, not only does this not work, but it breaks my delete button.

Thanks for your help.