[Soot-list] how to get call graph in dot file

[tang]

Hi

Just a very basic and quick question.
I'm using soot eclipse plug-in, and I want to see the call graph 
generated by soot (or spark). I have tried a lot of different 
configurations, but still no dot file generated. Can you show me how to 
configure soot to get it?

For example, currently, I use whole-program mode for general options,  
call-graph constructor enabled, spark enabled, but this don't work. And 
I cannot find any help from the documents.

Many thanks!

Mei tang