public StubVisualTreeItemViewModel(
     VisualTreeViewModel treeViewModel,
     VisualTreeItemViewModel parent,
     string displayName = "Loading...",
     string description = "Please wait while more content is loaded...")
     : base(treeViewModel, parent)
 {
     _displayName = displayName;
     _description = description;
 }
 public StubTreeItemViewModel(
     VisualTreeViewModel treeModel,
     TreeItemViewModel parent,
     string displayName = "Loading...",
     string description = "Please wait while more content is loaded...")
     : base(treeModel, parent)
 {
     _displayName = displayName;
     _description = description;
 }
 public VisualTreeItemViewModel(
     VisualTreeViewModel treeViewViewModel,
     VisualTreeItemViewModel parent) : base(treeViewViewModel, parent)
 {
 }