I'm probably off base with this, but would using something like the collision free event work? Look at the GE Tutorial:"Collision Free". You might be able to figure something about climbing obstacles from it.
i've tried to work with CollisionFree but for now, don't know how to use it to make myActor climb up a slope. But i found another (silly) way to do it.
On Collision with the slope, actor takes var diagonalMove and on KeyDown Right :
x=x+1; y=y-1;
So he can now.. Climb-up-the-slope ! Silly, hum ?
Anyway thanx for your help. The Collision Free tutorial will soon be helpful to me, i'm sure. Thanx again