public void AddExecutionInputPort(string name = null)
{
//TODO this should create an empty gameobject and port view should create its own UIelements
var newport = new GameObject();
newport.AddComponent <ExecutionPortModel>();
// initialze the port
newport.GetComponent <ExecutionPortModel>().init(this, ExecutionInputs.Count, PortModel.porttype.input, name);
//hookup the ports listener to the nodes propertychanged event, and hook
// handlers on the node back from the ports connection events
this.PropertyChanged += newport.GetComponent <ExecutionPortModel>().NodePropertyChangeEventHandler;
newport.GetComponent <ExecutionPortModel>().PortConnected += PortConnected;
newport.GetComponent <ExecutionPortModel>().PortDisconnected += PortDisconnected;
ExecutionInputs.Add(newport.GetComponent <ExecutionPortModel>());
}
