How do I set up destruction of these instances correctly?

Hi,

As per file located at:

http://filebin.ca/28WTBGe8uayB/Drops.capx

On lines 13 and 14 I have tried to do it so it only allows one 'Drop' at a time to spawn, basically it can not spawn more than drop ever. How do I set this up and what am I doing wrong here?

Commented Capx

https://dl.dropboxusercontent.com/u/485 ... roved.capx

added a condition to check if drop.count is 0 in the creation event..

Many thanks, works perfectly! Always like how you comment it because I can see exactly where I have gone wrong, it would seem I was over thinking it as per usual.