Qsys "Generate HDL" stops after save

Not a bug, but quite an irritation - I make changes to my Qsys System, and then hit "Generate HDL" and go make myself some tea or similar. And then come back a couple of minutes later to find that it has managed to "Save" the .QSYS file and then stops waiting for me to close that dialog box before it goes on to do the hard work of generating the HDL. Not a big disaster if it was just 2 minutes while I put the kettle on, etc, but if I've gone onto work on something else, eg add the new QSYS exported signals to my VHDL top file then that can put things back quite a bit! Why does it need me to "Close" the dialog after it has saved, can't it just bat on without intervention?

Cheers,

Simon