How do I make a platform enemy walk on the sides and under side of a platform?

I know how to make the enemy ai walk on a platform and when it reaches the end it stops, but instead of stopping I want it to walk on the side then walk on the underside and repeat this (like a snail on a platform, it doesn't fall off it just sticks to the platform.)

Check out this demo:

howtoconstructdemos.com/enemies-walking-around-walls-metroid-style-or-patrolling-the-perimeter-enemy-ai-capx

It doesn't use Platform behavior though.

Thanks, just by looking at the preview it should be exactly what I need. Thank you.. But if I need any further help I will post back.