New in v4.0

• Node Sorting
  
  • r.a.d.treeview now fully supports node sorting. The only thing you need to do is to set the Sort property to one of the following values: Ascending, Descending, None.
     
• DataBinding
  
  • r.a.d.treeview supports binding to datasource (DataSet, DataTable) so you can easily populate a treeview instance with only a few lines of code. The built-in databinding support auto-binding from a single self-referencing table with ID -> ParentID relation
     
• Keyboard Support
  
  • r.a.d.treeview can be fully navigated using the keyboard. You can focus on a treeview with a predefined Alt+Key combination, navigate through the nodes, expand/collapse, select, and check/uncheck nodes.
     
• Ability for Customization of Individual Nodes
  
  • Each node (RadTreeNode) can now have separate Css classes for default, hover and selected state.

1. Context menus support
   Expand the functionality of r.a.d.treeview by adding context (right-click) menus to any treenode. Each context-menu item can fire both server and client events, and are also customizable through CSS. 
2. Fine-tuned behavior with Before / After events
   The new client-side event model provides greater flexibility allowing you to attach custom JavaScript functions before and after a node is highlighted, clicked, checked, toggled, etc. Events are fired also before and after a context menu item is clicked.
3. Programmatic checking / unchecking of nodes
   You can now easily check/uncheck nodes from the code-behind to facilitate higher interactivity of your treeviews.
4. Check / uncheck child nodes along with parent
   A very convenient and expected behavior of every treeview is that all subnodes should be checked/unchecked whenever the parent node is checked/unchecked respectively. This spares the effort for repetitive clicking that may even be impossible for larger structures. 
5. Enhanced "LoadOnDemand" for huge structures
   The LoadOnDemand mode has been optimized to support tens of thousands of treenodes. On a 512 MB RAM 2Ghz P4 machine LoadOnDemand for 10,000 nodes responds in less than a second. For even better performance you can use caching.
6. Group styles for fast and consistent formatting
   The new version of r.a.d.treeviewprovides mechanisms for batch formatting of nodes and menu-items with respect to their state, i.e. NodeStyle, HoverNodeStyle, SelectedNodeStyle, ContextMenuItemStyle, and ContextMenuItemHoverStyle.
7. Linear collections for accessing all treenodes at once
   You can now access all treenodes in a linear collection without writing any recursive code. At the server-side you are provided with an ArrayList, while at the client-site you can use the generated JavaScript array.