for example :

i want to send an email via button
in my_button :
    for rec in self :

rec.send_mail

rec.boolean = True

so if the user want to send an email to many user at the same time so users will use default fuction Partner Mass Mailing.
in default didn't have a rec.bolean = True.

so i want to do something like this :
    each time user send_email :

in xml will automatically trigger boolean in the python via that XML.    ​

The point is i want to make the boolean to true via xml.