Why does Parallels steal focus multiple times when starting?

I know parallels is going to take a while to start up so I fire it up and get on with something else. Suddenly Parallels is in my face and what I've been typing is lost. I click on my work to raise it back to the top, start typing again and next thing Parallels has done it again.. and again... and again!

This is before any virtual machine has started. (Once they are running every windows app makes it worse but I concede that might not be Parallels' fault.)

Very irritating. Can it be fixed?