In my search for a good Wizard dialog, I found one here at...
Unfortunately it didn't work well... or at all with the latest versions of Ext GWT and GWT. So I cleaned up the errors, and adjusted the class to extend the ContentPanel instead of the Window.
I take no credit for the original idea, or coding, all I did was make it work for gwt 2.x.
Add the jar file to your build path.
Modify your gwt.xml file, and add the inherited module.
I also added three methods to the WizardPanel
Empty constructor, if you don't want to add cards right away, you can now do that.
Allows you to add individual cards to the WizardPanel
Allows you to set the card list.
WizardPanel wp = new WizardPanel();
ArrayList<WizardCard> cards = new ArrayList<WizardCard>();
cards.add(new WizardCard("Card 1"));
cards.add(new WizardCard("Card 2"));
cards.add(new WizardCard("Card 3"));
Added a new listener to the WizardCard. It listens for the card show event. You can set the listener by invoking the setCardShowListener method.
The project I was using java for has died out completely, so I no longer have the time to maintain this code. I hope that it serves as an example of something that can be done using Ext GWT. I would recommend reading over the original authors post for examples or resources required, and wish you the best.