Hello Tom Ray,
By design If you set a valid value to the Min / MaxDate properties and select a month that is out of this range, the embedded DateInput
control will fire the OnError client side event, and its invalid style will be applied. This way the user will be prevented from selecting an invalid month.
Certainly, you can implement your own client-side code that check whether the selected month is in the specified range and disable the OK button in case the selection is invalid. I am afraid that currently this functionality is not supported out-of-the box.
I hope this helps,
the Telerik team
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