post-ui.cc - Where is the context menu created?

Hi,

I am trying to make myself familiar with the Pan2 source code. 
I am trying to figure out where in gui/post-ui.cc the popupmenu is created 
and where it is populated with the installed spellchecker languages.

I try to fix the bug that internally always English is applied as 
spellchecker language on the text but in the context menu always the first 
language is selected.

Can somebody help me?

Robert