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public class FocusOnLoadBehavior extends AbstractBehavior
{
    private Component component;

    public void bind( Component component )
    {
        this.component = component;
        component.setOutputMarkupId(true);
    }

    public void renderHead( IHeaderResponse iHeaderResponse )
    {
        super.renderHead(iHeaderResponse);
        iHeaderResponse.renderOnLoadJavascript("document.getElementById('" + component.getMarkupId() + "').focus()");
    }

    public boolean isTemporary()
    {
        // remove the behavior after component has been rendered       
        return true;
    }
}  

public class MyPage extends WebPage
{
  public MyPage()
  {
    Form form = new Form("form");
    TextField field1 = new TextField("field1");
    field1.add(new FocusOnLoadBehavior());
    form.add(field1);
    add(form);
  }
}