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some information about getting started with RadInputPrompt. In short, you define some sort of handler as an argument of the Show method. You don't need to manually fire any events. The InputPromptClosedEventArgs are evaluated when some of the buttons is pressed and you can just take the information that concerns you (for example the text) from these args as shown in the example.
I hope this information helps. Let me know if you need additional assistance.
All the best,
the Telerik team
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