mainToolBar.setId("main_tool_bar");
rootPanel.add(mainToolBar);
rootPanel.setWidgetPosition(mainToolBar, 0, DEFAULT_MENU_HEIGTH);
//cargo el panel tab
MainTabPanel mainTabPanel = new MainTabPanel();
mainTabPanel.setId("main_tab_panel");
rootPanel.add(mainTabPanel);
rootPanel.setWidgetPosition(mainTabPanel, 0, new Integer(2*DEFAULT_MENU_HEIGTH));
//cargo la barra de estado
MainStatusBar mainStatusBar = new MainStatusBar();