I think Linux/Ubuntu is
yet again more easy to use than OSX, but I don't even feel like bitching today. Here it goes:
++ Open Script Editor and type this updating the name of the VM you want to launch:
[code lang="bash"]do shell script "/Applications/VirtualBox.App/Contents/MacOS/VBoxManage startvm your_vm_name"[/code]
++ Save as
Application Bundle and check
Run Only.
Off you go.
Thanks.