Hey vicky_obee, I am new to navivoice as well and this is what seems to work for me. Ol33l will be able to tell you for sure.
If you look in the .XML file you will see the following commands.
<p val="400">open navigation</p>
<p val="401">close navigation</p>
<p val="402">minimize navigation</p>
<p val="403">restore navigation</p>
<p val="404">maximize navigation</p>
<p val="405">focus navigation</p>
If you look further down the file you will also see this:
<!-- User set programs. 400-405 must refer to navigation.
Your programs from 406 on to 495
Every 6 lines refer to a program
Hence I guees every six lines is the commands for (opening,closing,minimizing,restoring,maximising and focusing). so if for example you have a command for opening a program at "p val=412," I would make the command to close this program at "p val=413," and so on.
I hope this works. If Im wrong.....sorry.