Well, I don't know exactly how I solved this but it worked.
I added the following to the end of the file conf/extra/httpd-vhosts.conf
:
<VirtualHost dev.mysite.com.br dev.mysite.uy>
ServerAdmin admin@mysite.com.br
DocumentRoot "C:/sites/mysite"
ServerName dev.mysite.com.br
</VirtualHost>
Then I 'Shutdown and exit' VertrigoServ and executed it again as Windows administrator.
It seems VertrigoServ has a default configuration (localhost) for anything that is not in a VirtualHost.