Base class of custom object

Hi,

Is it possibile to get standard base class of custom object using any property? ClrClassName will give me the custom class name to which the object belongs which might be extended/ inhertied from a standard class. e.g. the application has extended Java Button class as ExtendedButton. So, my ClrClassName will give me ExtendedButton. However, I want to know if there is any property which can give me the base class name i.e. JButton.