multiple sharepoint projects - visual studio

hi all,

I have 2 SharePoint porjects.

I open the first SP Project and I set it as (Startup project)
I add the second project, now I have Both projects in one solution, so far so good.

Now I open the Package.packe file and I can now add the features form the second project.

And this work to when I Deploy or Publish.

my Question is: How can I  activate the features from SECOND PROJECT automatically?

P.S. I set the Propertie of the feature to: Always force Install  to true, but this doesnt help.

thanks in advance
Ahmad

---

SP 2013 & SPD 2013 & VS 2013 & MSSQL 2012