RadTreeView fully supports checkboxes, which are displayed next to the TreeNodes.
You can enable the checkboxes mode by setting the treeview's CheckBoxes property
<telerik:RadTreeView ID="RadTreeView1" runat="server" CheckBoxes="True" ... />
All TreeNodes will display checkboxes if the CheckBoxes property has been
enabled. You can, however, disable a checkbox for a particular TreeNode by settings
its Checkable property to "False". By default checking a node will not check
the child nodes. You can enable this behavior by setting the CheckChildNodes
property to "True"
You can enable tri-state checkboxes by setting the TriStateCheckBoxes
property to "True".
You can retrieve all checked TreeNodes upon a postback to the server-side by using
the CheckedNodes property, which returns an ArrayList collection of the TreeNodes
that have been checked in the browser.
You do not have to set any property to make the treeview postback upon checking
a node. If you simply hook on the NodeCheck server event, the treeview
will postback upon checking. If you need to disable the postback for certain nodes,
you can use the OnClientNodeChecking event and call the set_cancel(true)
method of the event argumentrs