[Paraview] SubProxy/ProxyProperty

[John Biddiscombe]

I'm making some changes to the particle tracer, which allow a 
TerminationStrategy and an InjectionStrategy to be set. These are small 
classes which act s helpers to the particle tracer to decide when to 
kill off particles etc.

If I define these as classes and setup xml descriptions of them in 
utilities.xml they seem to satisfy the compilation and instantiation 
requirements of paraview.

But

When I attempt to create the GUI for the particle tracer, I tried 
setting a ProxyProperty referring to the strategy class, and nothing 
appears in the GUI, so I tried setting it as a SubProxy within the 
Particle tracer XML. It also did not make anything ppear in the GUI.

1) Can I instantiate the GUI part of the proxy object automatically - 
the only other classes whic do something similar are the cut/clip etc 
using widgets as sub proxies
2) Specifically - what is the difference between declaring a subproxy 
(=TerminationStrategy) or a ProxyProperty (=TerminationStrategy). When 
should one use one, or the other.

The Strategy has a number of simple int/double parameters so ought to be 
easy to instantiate easily. How's it done?

thanks

JB