OnClientNodeChecking: This event event fires prior to selecting a checkbox in RadTreeView. The function has a single parameter, the instance of the checked Node. This event can be used to prevent the Node from being checked.
OnClientNodeChecked: This event is fired immediately after OnClientNodeChecking event, the only difference is that the checked status of the Node is changed to reflect the new value and the action cannot be cancelled.
get_checked(): This function returns True if the Node is checked and False if the Node is not checked
get_parent(): Returns the parent Node of a child Node
set_checked(true/false): Checks or un-checks a given Node
get_checkElement(): Returns the HTML element that corresponds to the checkbox of the Node
For more information, see Client-Side Programming.