We`ve logged your question as a feature request in our PITS
( TreeView: Validation abilities based on INotifyDataErrorInfo interface like in input controls
) where you will be soon able to vote for.
A sample validation of whether there are some checked items in the tree could be achieved with using the mouse over event handler of the RadTreeView. You can check whether the RadTreeView.CheckedItems.Count
is 0 or not and throw a warning message.
Hope this helped you.
the Telerik team
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