You could call a Microflow in the AfterStartup option of the Project Settings
In that microflow, you could put some logic to populate a message table and then display that table on the main page of the app.
Daniel
Hey Bernardo,
in a datagrid you should be able to easily do this by using the Grid Cell Styler https://appstore.home.mendix.com/link/app/106254/
Hope that helps.