How to modify ChildMotion.position via script during runtime

Hello, I want to modify the ChildMotion.position in a BlendTree during runtime, yet I am unable to set the value of it.

Here I read that you should be able to set the position ({get; set;}), yet my code does not seem to achieve this.

     public void startme () {
         if(eBlendTree != null){
             Debug.Log("\t.::[Blend Tree]::.\nName |" + eBlendTree.name + "| & Type |" + eBlendTree.blendType + "| ECSys Length Limit: " + ECSys.LengthLimit);
             for(int i = 0; i < eBlendTree.children.Length; i++){
 
                 Debug.Log("_Emotion [" + eBlendTree.children[i].motion.name + "]\n_Position [" + eBlendTree.children[i].position + "]");
                 Vector2 newPos = eBlendTree.children[i].position * 5;
                 eBlendTree.children[i].position = newPos;
                 Debug.Log("------" + newPos);
                 Debug.Log("++Emotion [" + eBlendTree.children[i].motion.name + "]\n++Position [" + eBlendTree.children[i].position + "]");
             }
 
         }
     }

Here you can see the Debug.Log output:

I don't see why it is not working, there are no compiler errors, just the values are not getting updated during runtime (that could be the problem because this might be supposed to happen only in the unity editor, yet if that is so, is there another way to modify blendTree stuff during runtime?)

EDIT*** After creating a button for the editor, to call a function to change the values, the problem remained, so it is not Editor/Playmode fault, it is something else.