/// <summary>
 /// called by MultiPanes inside AddViewer
 /// </summary>
 /// <param name="mp"></param>
 public void SetDesigner(MultiPanes mp)
 {
     _holder = mp;
     //_objExplorer.RootClassNode.ClassData.SetDesignerHolder(mp);
 }
 public void SetDesignerHolder(MultiPanes holder)
 {
     _viewsHolder = holder;
 }