I define an ICommand similar to what is found in src\Setup\WixBA\
InstallationViewModel.cs See ICommand LaunchNewsCommand or similar. The
xaml can then have something like:
<Hyperlink Command="{Binding MyCommand}"
With regard to showing a message, there are a number of different ways to
approach this. Look at WixBA InstallationViewModel.cs ExecuteError for the
way they present a message dialog. Generally I don't have much experience
using the Condition in the msi, as I use the BA detect handlers to validate
my configuration and if necessary give feedback to the user.
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