I've created a thread in stackoverflow 
site<http://stackoverflow.com/questions/10103998/add-navigation-buttons-to-an-abstractcell>where
 I saied:

I've created an AbstractCell<String> to create the header that says 
"welcome to your mobile..." and I would like to add two buttons in this 
AbstractCell: the fist to return to the previous page, and the second to 
return to the welcome page. I've used to create the header element a class 
that extendsAbstractCell<String> using this code:

public class HeaderCell extends AbstractCell<String> {

    interface Templates extends SafeHtmlTemplates {

        String style = "HeaderPanel";

        @SafeHtmlTemplates.Template("<div class=\""+style+"\">{0}</div>")
        SafeHtml cell(SafeHtml value);
    }

    private Templates templates = GWT.create(Templates.class);

    interface templateWithButton extends SafeHtmlTemplates {

    }
    @Override
    public void render(com.google.gwt.cell.client.Cell.Context context,
            String value, SafeHtmlBuilder sb) {
        SafeHtml safeValue = SafeHtmlUtils.fromString(value);

        SafeHtml rendered = templates.cell(safeValue);

        sb.append(rendered);
    }

}

*So please if you have any answer, please post it.
Thanks*

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