This button is used to open/collapse a specific text field 
in which users can write a text providing detailed explanations
about the radiation faces to be coupled with conduction.
 
It is often a good idea to spend some time to 
describe what radiation references correspond to what part of the conduction
 mesh,
especially when dealing with complex cases 
with numerous references.
 
The text will NOT be interpreted by SYRTHES, but will be 
dumped as comments in the ASCII SYRTHES parameter file.
 ________________________
 SYRTHES version   : VERSION_SYRTHES
 Name help file  : pushButton_2.html
 I. Rupp, C. Peniguel  -  may 2014
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