/// <summary>
    /// Create a selection frame. The method set is used during the creation.
    /// </summary>
    public SelectionFrame CreateSelectionFrame(Transform _parent, Vector3 _pos, Vector3 _size, Material _material = null)
    {
        GameObject     go             = Instantiate(prefabs["SelectionFrame"] as GameObject, _parent);
        SelectionFrame selectionFrame = go.GetComponent <SelectionFrame>();

        selectionFrame.Set(_pos, _size, _material);

        popUpList.Add(go);

        return(selectionFrame);
    }