Yes, did you check out the platform example I created? The link is mentioned in this thread.
When you create your sprite, assuming you are making a platform game, your character animations are at 0 degrees.
When you press right, your character should face 0 degrees, and when you press right, set angel to 90 degrees, construct will mirror animation if mirror animation is. checked
Here is the (stripped) event I am using for my game:
Key Right Arrow Down
Spankyboot[Platform].Vectory Equal to 0.
Spanky: Set Animation to "walk"
Spanky: Play Current Animation
Spanky: Set Angle to 0 Degrees
Spankyboot: Set angle to 0 degrees
The "Spankyboot" is my detector, so you may replace that with your platform object if not using one.
I highly recommend looking at the example. If you need help upload your cap file, you can use fileden, that's what I use, it is very easy. Hope this helps.