Connected objects and monitoring systems continuously produce data about their environment. Dashboards are then designed to aggregate and present these data to end-users. Technologies used to design and implement visualization dashboards are babbling from a software engineering point of view. This paper highlights how this domain could benefit from leveraging separation of concerns and software composition paradigms to support dashboard design. Categories and Subject Descriptors D.2.8 [Software Engineering]: Data visualization, Software composition Keywords Visualization, sensor, data, composition