[Paraview] Re-applying a plugin doesn't change the output?

[David Doria]

If I have a property such as:

         <DoubleVectorProperty
                            name="Neighbor Radius"
                              command="SetRadius"
                              number_of_elements="1"
                              default_values="1.0">
         </DoubleVectorProperty>

If I load the plugin and immediately set the value and Apply the
filter, the output is correct. However, if I then go back and change
the value and Apply again, the output does not change. Is there
something that needs to be done to enable this functionality?

Thanks,

David