Beginner question

[jfgoude]

Hi, I am an old programmer (yet retired) and I can say I was used to work with XML and XSL, But if I know .xml and .xsl files are used to disply information around the screen, I can not understand how FM handles the mouseclick events they treat in sidebar or menu  header. I found in client object browser.xml some lines referring to some kind of " <widget class="backroom_advice_trigger_button" ..." but I can not imagine how the whole stuff works.

 

Does someone have the idea of how all this is handled ?

Edited August 28 by jfgoude
correction