Com Interface & backward compatibility

Hi,

Our application use PDF creator through C++ interface, our apps work fine with version 0.99, but not version 1.0. Because your class interface id change for each version.

I know you add news fonctionnality, but you can use class inheritance to extend your inerface without breaking backward compatibility.

please consider a better backward compatibity for futur version, it is very important for c++/com users.

Best reagrds