Customize Data Views not working correctly?

I have a class which implements the Map interface. But since the class contains other functionality too, I don't wan't it to be displayed as a Map in the debugger. So therefore I add a new type renderer in 'Customize Data Views', where I put this class in 'Apply renderer to objects of type'. But from then on EVERY object is displayed by this renderer, not only objects of that class. Am I doing something wrong?