Instantiated NavMesh movement?

Hello,
I have a NavMesh game object and I've baked the scene and everything and it works perfectly, however if I instantiate the NavMesh Agent then it wont move anywhere.
I can't drag my "Destination" (empty game object) onto the NavMesh Agent Prefab.

The current code for NavMeshAgent is simple:

Code (CSharp):

1. NavMesh= GetComponent<NavMeshAgent>();

Code (CSharp):

1. void Update () {
2.         NavMesh.SetDestination(Destination.position);

And it works perfectly. The only issue is that I can't add Destination Game Object to a prefab. Any other solutions?

Thank you

 

[SOLVED]​

For those of you that are interested I solved the problem by setting the destination to Empty Game Object and from there I can control the prefab.
As far as I found out it's not possible to put GameObjects on prefabs.