Declarative UI + Google Maps

[Nicolas]

Hi I'm trying to use Google Maps in my project so I add
<inherits name='com.google.gwt.maps.GoogleMaps' />
in the gwt.xml file. I use deferred binding for create the UI and the
View.ui.xml file's code is:
<!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/
xhtml.ent">
<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"
        xmlns:g="urn:import:com.google.gwt.user.client.ui"
xmlns:p1="urn:import:com.google.gwt.user.cellview.client"
        xmlns:p2="urn:import:com.google.gwt.maps.client">
        <ui:style>
                .important {
                        font-weight: bold;
                }
        </ui:style>
<g:VerticalPanel ui:field="rootPanel" width="100%" height="100%">
        <p2:MapWidget ui:field='map'  />
</g:VerticalPanel>
</ui:UiBinder>
The View.java file's code is:
import com.google.gwt.core.client.GWT;
import com.google.gwt.maps.client.MapWidget;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Widget;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.MenuBar;
import com.google.gwt.user.cellview.client.CellTable;
public class View extends Composite {
private static ViewUiBinder uiBinder = GWT
                        .create(ViewUiBinder.class);
        @UiField VerticalPanel rootPanel;
        @UiField MapWidget map;
interface ViewUiBinder extends UiBinder<Widget, View> {
        }
        public View() {
                initWidget(uiBinder.createAndBindUi(this));
        }
}

The problem is when i switch from the code view to the design view
elipse show me this error:
Error loading module(s).
GWT Designer can't load a module because of error in gwt.xml module
description, incorrect resource which requires processing with GWT
generator or by some other configuration error.
Please check your $project_dir/.gwt/.gwt-log for GWT-specific errors.
This log has the following error messages:
[ERROR] Failed to create an instance of
'com.google.gwt.maps.client.MapWidget' via deferred binding
Show stack trace.
Hide stack trace.
Stack trace:
org.eclipse.wb.internal.core.utils.exception.DesignerException: 4108
(Error loading module(s).).
[ERROR] Failed to create an instance of
'com.google.gwt.maps.client.MapWidget' via deferred binding.
The Google Maps API's version is gwt-maps-1.1.1-rc1.jar.
I would like to know what I doing wrong.??
Is the Google Maps API version the lastest version??
Thanks.

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