I fully understand your disappointment. However, please note that the RadTreeView control is actually a navigation control. Also, the scenarios where it can be used for editing are not common. This is the reason why the data validation is not yet supported out of the box.
On the other hand you can use the validation feature of our RadMaskedInput controls. You can use for example the RadMaksedTextInput
control and set it as ItemEditTemplate
of the RadTreeView control.
Pavel R. Pavlov
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