/// <summary>
 /// This method iterates the slideshow tree to retrieve
 /// the node with the given node id.
 /// </summary>
 /// <param name="nodeID">A <see cref="String"/> with a node id to search for</param>
 /// <returns>The <see cref="SlideshowTreeNode"/> with the given id,
 /// or null if no one is found.</returns>
 private SlideshowTreeNode GetTreeNodeByID(string nodeID)
 {
     return(Slideshow.IterateTreeNodes(nodeID, (SlideshowTreeNode)this.trvSlideshow.Nodes[0], true));
 }
 /// <summary>
 /// This method iterates the slideshow tree to retrieve
 /// the node with the given name.
 /// </summary>
 /// <param name="name">A <see cref="String"/> with a node name to search for</param>
 /// <returns>The <see cref="SlideshowTreeNode"/> with the given name,
 /// or null if no one is found.</returns>
 private SlideshowTreeNode GetTreeNodeByName(string name)
 {
     return(Slideshow.IterateTreeNodes(name, (SlideshowTreeNode)this.trvSlideshow.Nodes[0], false));
 }