How to set new GameObject as child of Components GameObject?

Question

I want to create an empty GameObject that is a child of the Components GameObject.

Example: I have a simple spline and I am using the child objects as the control points. I have a button to add new control points which uses the following code to create a new object and should also set the new GameObject as a child of the scripts object.

public void addNewNode()
{
   var g = new GameObject();
   g.transform.parent = this.transform;
}

This implementation does not work and does not show the object in the inspector which I assume means something went wrong and the object was destroyed.

Edit:

To test that setting parent was working properly I printed the name of g parent transform. It printed the correct name so I think the problem is that setting the parent is not being reflected in the editor. NOTE: I am using a [CustomEditor()] script in addition to the MonoBehaviour script if this effects something with unity.

Edit 2 - Minimal Full Code:

[CustomEditor(typeof(SplineManager))]
public class SplineManagerInspector : Editor {

public override void OnInspectorGUI()
{
    SplineManager spMngr = (SplineManager)target;

    // additional code to add public variables

    if (GUILayout.Button ("Add New Node")) {
        spMngr.addNewNode ();
        EditorUtility.SetDirty (target);
    }

    // code to add some public variables

    if (GUI.changed) {
        spMngr.valuesChanged ();
        EditorUtility.SetDirty (target);
    }
}
}


[RequireComponent (typeof(LineRenderer))]
public class SplineManager : MonoBehaviour
{
    public SplineContainer splineContainer = new SplineContainer ();
    public LineRenderer lineRenderer;
    private GameObject gObj;

    // additional code to deal with spline events/actions.

    public void addNewNode ()
    {
        Debug.Log ("new node");
        gObj = new GameObject ();
        gObj.transform.parent = this.gameObject.transform;  // this does not work... (shows nothing)
    }
}

Answer 1

public void addNewNode( GameObject parentOb)
{
    GameObject childOb = new GameObject("name");
    childOb.transform.SetParent(parentOb);
}

or

private GameObject childObj;
private GameObject otherObj;

public void addNewNode()
{
    childObj = new GameObject("name");
    // in case you want the new gameobject to be a child of the gameobject that your script is attached to
    childObj.transform.parent = this.gameObject.transform;
    // we can use .SetParent as well
    otherObj.transform.SetParent(childObj);
}