How do you write to a widget from a Python file in an OOT?

[Elmore's]

I had asked this question earlier in a different form but did not receive a 
response so I am trying a different approach using a greatly simplified 
flowgraph to illustrate my point.

I have attached the three pertinent files.

Test is an OOT module. I want to be able to trigger a callback set_IGain (which 
works) and write a value to the I_Gain GUI Entry (which doesn’t work). I have 
tried various imports, setting of variables and any other scheme that I could 
think of. I have not included any specific piece of code in the callback.

This seems like such a simple thing to do but nothing works. I get various 
errors or nothing is written when I eliminate the errors. I must be missing a 
basic point.

Please help me get over this hump.

Jim

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test.py
Description: Binary data

<?xml version="1.0"?>
<block>
  <name>test</name>
  <key>test_sr_test</key>
  <category>test_sr</category>
  <import>import test_sr</import>
  <make>test_sr.test($I_Gain, $Change_I_Gain)</make>
  <callback>set_IGain($Change_I_Gain)</callback>
  <!-- Make one 'param' node for every Parameter you want settable from the GUI.
       Sub-nodes:
       * name
       * key (makes the value accessible as $keyname, e.g. in the make node)
       * type -->
  <param>
    <name>I_Gain</name>
    <key>I_Gain</key>
    <value>0</value>
    <type>raw</type>
  </param>

  <param>
    <name>Change_I_Gain</name>
    <key>Change_I_Gain</key>
    <value>0</value>
    <type>raw</type>
  </param>
</block>