GUI default choices not restored when override checkbox is uncheck

[GoogleCodeExporter]

What steps will reproduce the problem?
1.Open the Stream Configuration and select Protocol Data/UDP 
  Default Source port = 103
2.Mark the override checkbox for the source port, and set it to 123
3.Uncheck the override checkbox.

What is the expected output? What do you see instead?
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The GUI displays 123 grayed out.
It should display the same value which is sent out = 103.
Note that a fix should, if the user again checks the override 
display what the user previously wrote, I.E: 123.
If the user saves the stream, and goes back to the main window,
then the GUI should forget about the previous input.

What version and revision of the product are you using (available in the
About dialog)? On what operating system?

ostinato-5.8.1 on Ubuntu 11.04 running  2.6.38-16-generic-pae

Please provide any additional information below.
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This is a cosmetic problem which does not affect the actual
packet sent out.

Original issue reported on code.google.com by emagii....@gmail.com on 4 Oct 2012 at 9:10

[GoogleCodeExporter]

Version from memory was wrong. It is of couse ostinato-0.5.1

Original comment by emagii....@gmail.com on 4 Oct 2012 at 9:11