This project creates few of missing widgets, namely Date/Time Picker and Dual Pane List, for Smart GWT Library which is available at http://code.google.com/p/smartgwt/.

Note that widgets are not converted yet to GWT modules so you would have to include the source as is in your project.

Check out the demo and source file of the demo.

If you like to use this, you would need to download the source file and include the files in your GWT project.