We needed once to have a notification popup like Facebook or Gmail notification to show for a few seconds in the right bottom corner of our GWT application within a liferay portal. A Notification is an info bubble displayed for few seconds in bottom right corner of the screen.
While this component can be found in third-party libraries (based on GWT) such as SmartGWT, GXT, GQuery and Vaadin, using one of those libraries will also add a load of code and resources that we never need. Also using native GWT widget is greater in terms of performance. So as long as customization of GWT widget is possible, we prefer avoiding 3rd party gwt libraries. I talked more about the benefits of using native GWT widget rather than GXT & SmartGWT in this article (in french). And for a comparison between plain GWT widget performance Vs. GXT performance, please check this previous article where it shows how fast are native GWT widget comparing with 3rd party libraries.
While this component can be found in third-party libraries (based on GWT) such as SmartGWT, GXT, GQuery and Vaadin, using one of those libraries will also add a load of code and resources that we never need. Also using native GWT widget is greater in terms of performance. So as long as customization of GWT widget is possible, we prefer avoiding 3rd party gwt libraries. I talked more about the benefits of using native GWT widget rather than GXT & SmartGWT in this article (in french). And for a comparison between plain GWT widget performance Vs. GXT performance, please check this previous article where it shows how fast are native GWT widget comparing with 3rd party libraries.