Visual Studio installer project - adding another step to the uninstaller

I have a Visual Studio setup project where I need to add another step to the uninstaller for displaying some important info to the user. This needs to be done before the anything gets removed.

From within VS itself, it only seems possible to add new dialogs to the installation process.

How d开发者_开发知识库o I go about adding new dialogs to the uninstaller ?

Thanks!

Cheat by adding a topic to the Help menu- Help/Before Uninstalling