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This is not something we've exposed. In fact there really isn't an API for this. You may be able to do this with a Zimlet and just let it hover over the app at startup. If you want to create a entire new app and change the view that's a bit outside normal Zimlet work and would require lots of code changes. Unfortunately there is no doc or how-to for this. You'll just have to read the code and follow the examples in the Zimbra code itself.