[Discuss-gnuradio] Additional code to GRC flowgraph

Hi

I'm working with a receiver application in GNU Radio Companion. I would like to add some additional code to the top block but I still want to be able to work with the GRC. Is there a way to add this extra code without the code will be removed when I re-generate the flowgraph from GRC
    or
    Could I create a new block that can access the variables in the top block or can execute the set/get functions for the variables in the top block.

    What I'm trying to accomplish is that every 3rd second I will check the SNR and then do som trimming of a freq-offset. I'm a newbie with GNU Radio and Python but have read through the guided tutorials.

    BR
    Daniel Brogren
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