Hello Jeffrey,
Thank you for writing.
RadControls use a little bit different mechanism to show ToolTips. You need to subscribe to the ToolTipTextNeeded event of your RadDateTimePicker amd set the text as follows:
Since we are using
RadToolTip, you can read more about it here:
RadToolTip | UI for WinForms Documentation.
Let me know, should you have further questions.
Regards,
George
Telerik
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