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Yes, why not. You can inherit for ReminderBase and get a lot of information like LastReminderDisplayDate and an option to skip further reminders. However RadDiagnostics is a completely separate control and if you want parts of its data as well, you can, for example, create its instance inside your control. If you want to get some inspiration, you can have a look at the source code of RadControls, available for download at Telerik.com, and see how we have implemented our reminders.
the Telerik team
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