public static bool Equals <T>(this IEditorTreeViewItem <T> x, IEditorTreeViewItem <T> other)
 {
     return(x.TreeID == other.TreeID && x.TreeDepth == other.TreeDepth);
 }
 public static bool HasChildren <T>(this IEditorTreeViewItem <T> x)
 {
     return(x.Children != null && x.Children.Count > 0);
 }