About widgets management

I´m a newbie to GWT.
My scenario is:

My project is a web application. My idea is using a top menubar, with
some menuItems. Click on one of this menuItems, will "open" a widget
like a search form with a grid to show results, another kind of form,
etc. Like if a regular web page with links in a menu bar on top.
I have to main questions:

a) In case of implementing this with pure GWT, the menu and the pages
(by pages in this case I mean , widgets composite by forms, grids ,
etc ). Have I to create all widgets and show/hide them depending on
the menuItem clicked, or can I create / delete dinamically? Because
creating them it´s obviously inefficient.

b) I think it would be easier if the menu loads .html pages with GWT
widgets on them. So the widget loads when the html page loads. But I
don´t know if this is possible and how to do it with GWT (I mean, the
menubar made in GWT, acting like a regular HTML menu, like using
links).

Sorry if it´s not very clear what I´m trying to say, (because I know
it isnt), but I don´t know exaclty where to start or what to do
exaclty.

In resume, i want a web application with a menu where to select what
part of my application to show.

Thanks, and sorry for my English ;)

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