An example of doing this is in the wix source at:
src\Setup\WixBA\InstallationViewModel.cs
The event is registered in the class constructor (along with some other
event which are helpful):
WixBA.Model.Bootstrapper.Error += this.ExecuteError;
And then the ExecuteError handler has an example of displaying the message.
There are other examples in the same file of logging a message.
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