Simple CSS add-on that will hide the contents of a Grid Column until the user hovers over the row, by simply adding a CSS class to column. ``` grid.addComponentColumn(person -> { //this component will be invisible HorizontalLayout buttons = new HorizontalLayout(); Button edit = new Button(VaadinIcon.PENCIL.create()); //exclude this button so that it is always displayed edit.addClassName(HoverColumn.HOVER_COLUMN_EXCLUDE_CLASS); Button delete = new Button(VaadinIcon.TRASH.create()); buttons.add(edit,delete); return buttons; }).setClassNameGenerator(person -> { return HoverColumn.HOVER_COLUMN_CLASS; }); ``` Useful for hiding redundant button or status columns.