code: private void buildGui() {
  		setTitle(I18nProvider.getGlobal().commandError());
  		setHeaderIcon(WidgetLayout.iconError);
  		setIsModal(true);
  		setShowModalMask(true);
  		setModalMaskOpacity(WidgetLayout.modalMaskOpacity);
  		setWidth(WidgetLayout.exceptionWindowWidth);
  		setHeight(WidgetLayout.exceptionWindowHeightNormal);
  		setKeepInParentRect(WidgetLayout.exceptionWindowKeepInScreen);
  		setCanDragResize(true);
  		centerInPage();
  		setAutoSize(true);
  		addCloseClickHandler(this);
  
  		addItem(createErrorLayout(error));
  	}
docs: Build the entire GUI for this widget.