How to create instance of class that get data from 2 another instance?

[Suliman via Digitalmars-d-learn]

Oh mama mia! I did it!
http://www.everfall.com/paste/id.php?a5pp73ns1e4k

auto seismodownload = new seismoDownload(emsc_csem, this);
then:
auto mysql = new MySQL(parseconfig,eqs);

So could anybody show me better way? As I said I did not fully 
understand how use global class instance...