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:
sender, ToolTipTextNeededEventArgs e)
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.
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