I don't use GWT designer and probably will never do, like most people that
are building a long time with GWT.
Don't get me wrong: it's a great tool, but like with all visual designer
tools: with experience comes detail requirements that can't be done through
a designer tool.
Anyway, some advice on how to do it without designer:
Take a SimpleWidget panel, add that to the body, or other html element and
wen you want to go to another page simple replace the widget in
SimpleWidget.
in pseudo code:
SimpleWidget outer = new SimpleWidget();
RootPanel.get("pageId").add(outer);
outer.setWidget(page1); // showing page 1
...
going to page 2 some where in code:
outer.setWidget(page2); // showing page 2
Just put this outer panel in a central Register (Singleton class) such that
it can be reached from anywhere and you are done...
Then if you want, add to some Fade In/Out effect when adding page1 and
page2... Do this ina transparent way such that the code that add's page X
won't see this...
Fade effects looks so much better and professional when navigating. I
always do it by wrapping any GWT Panel through my own panel such that the
user that adds a widget to the panel won't notice the effect as it's a
property of the panel...
BTW: wrapping a panel is also good for testing..., see:
https://groups.google.com/forum/#!topic/google-web-toolkit/hwMKmuZv4BI
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