SSL in Domain Alias , How ?

[Frank.P]

A Domain with IP dedicated work with SSL Certificate (HTTPS) , but the domain alias load the domain certificate and said wrong certificate because the domain is not the same.

MainDomain.com with SSL
DomainAlias.com with MainDomain.com SSL

How can I set for MainDomain.com the right SSL and for DomainAlias a domain alias certificate ?

Thanks