In order to fire EditEnded event of RadPropertyGrid and get the edited value, you need to set the EditMode of the control to single. PropertyGridEditEndedEventArgs
expose a NewValue property which you can use to get the new input from the user. However, this property is read only so you will not be able to modify its value.
For this case, I suggest you applying IValueConverter
to the Binding of the needed PropertyDefinition and modify the user input in the ConvertBack method.
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