To enable keyboard support of RadTreeView you only have to set the TabIndex
A critical requirement for software accessibility is keyboard support as a complete
alternative to pointing devices (mouse, etc.).
Keyboard support is comprised of access keys, keyboard navigation, and keyboard
shortcuts. RadTreeView will seamlessly switch between mouse and keyboard navigation,
just like in desktop applications.
Using the AccessKey property, you can associate an activation combination
(access key) which will focus on the particular TreeNode and enable keyboard navigation.
When there are multiple treeviews on a given page, each of them may have a different
activation combination. To make the AccessKey work for a
node you should first set the NavigateUrl property of that node.