public Structure Express(Vector3 location,Structure parent)
 {
     Wheel wheelStructure = new Wheel();
         if(!wheelStructure.GenerateFromGene(this,location,parent)) // if we weren't able to instantiate the wheel
         {
             return null; 											// then we're done.  But if we were...
         }
         foreach(IGene child in children) 							// then go through all the children
         {
             child.Express(location, wheelStructure); 			// and express them.
         }
         return wheelStructure;
         //return null;
 }