How To Make An Object Stand On A Platform?

When I first try to make the object stand on a platform, I assume that I must use the move_bounce functions to make the player object stand on the platform object but instead it fell through the platform so that code didn't work for this situation. So, I had to use move_outside functions in order to make it worked. The move_bounce functions is used to make the object bounce off another object(or walls) so that the object can't go through the walls.
Now, for the move_outside functions.
move_outside_solid(dir,maxdist) Moves the instance in the direction until it no longer lies within a solid object. If there is no collision at the current position the instance is not moved. You can specify the maximal distance to move (use a negative number for an arbitrary distance).
move_outside_all(dir,maxdist) Same as the previous function but this time you move until outside any object, not just solid objects.

This action moves the instance in the desired direction until it a couple of pixels away from the solid object. The user can specify what maximal distance to move in pixels. (Use a negative number for an arbitrary distance).

Here is the code I used for making the object stand on a platform:

vspeed=0
{
move_outside_solid(90,-2)
}

vspeed in the code above is used to allow the object to stand above the platform. The vspeed can also be used to move the object vertically.