Common Handlers AttachEvent com.vaadin.flow.component.AttachEvent is sent after the component is attached to the UI. BlurEvent com.vaadin.flow.component.BlurNotifier.BlurEvent corresponds to the blur DOM event. DetachEvent com.vaadin.flow.component.DetachEvent is sent before the component is detached from the UI. FocusEvent com.vaadin.flow.component.FocusNotifier.FocusEvent corresponds to the focus DOM event. Common Attributes Data Components