Hangar Doors - Detecting When Fully Opened

I have been testing some simple code in relation to you do something when Hangar Door 'Open' property is set to true. This works fine but what I am finding is as soon as you tell the Hangar Doors to Open this value will change to true even though technically they are still sliding open. This is problematic because if you hit the Open button then say drop a bomb there is a very good chance its going to hit the still opening doors.

So my question is without the use of a timer block is there a...

Hangar Doors - Detecting When Fully Opened