What's event about X & Y Direction?

Hey all, i needed a help, i can't figure out how to manage events to AI sprites.

AI sprites are patrolling around the area with 4 dir ways, i have 4 frames shows up, down, left and right. They have no angles. I don't know what's event to change frames according to direction...

-X = Frame Left

+X = Frame Right

-Y = Frame Up

+Y = Frame Down

For example:

<img src="http://i.imgur.com/CEJ0H.png" border="0" />

I did it but it didn't work...

Would you help me?

Thanks.

Actually, i think i fixed due to this event what i figured out

<img src="http://i.imgur.com/KqF2b.png" border="0" />

I�ve used bullet behavior to make an enemy patrol like Zelda

you can use angel 270 instead of -90 if you want , the good point you answered yourself ^^