Make scene change by destroying objects, how?

I'd like my game to automatically change to next scene once all the enemies are destroyed! Please help, I'm sure it's absolutely obvious but so far I'm at a loss. Thanks a million for help.
Comments
When Attribute EnemiesD = 0
Change Scene
In your enemy actors, in each one, there needs to be - just before the Destroy Behavior in each case -
Change attribute EnemiesD to EnemiesD -1
:-)