The ResetButtonForListSelect is a Vaadin extension Add-on which adds a reset button to the caption of a ListSelect class. This reset-button will set the value of the extended ListSelect to "null" (via the setValue() method, so also fires valueChangeListeners if registered). Since the extension adds the reset button to the caption, this Add-on only works, when the extended ListSelect has a caption set before initialy rendered to the screen.