DetailPrototype

How do I add a DetailPrototype Mesh version at runtime? I have tried to fix this issue for a couple of days now, but can't seem to find a solution. Is this even possible if not I would love to know, so I can try to find a workaround instead. I have tried to assign the prototype value of the DetailPrototype. My code for generation of the detail prototypes:

     detailProtoTypes = new DetailPrototype[detail.Length];
         
     for (int d = 0; d < detail.Length; d++) {
         detailProtoTypes[d] = new DetailPrototype();
         detailProtoTypes[d].renderMode = DetailRenderMode.Grass;
         detailProtoTypes[d].prototype = detail[d];´
     }

I assign it later on. If I check in the Terrain Inspector it shows missing, and when I click edit on it, it is set to the normal detailprototype which doesn't take a GameObject as a parameter. (The one that takes a Texture)