VerticalPanel panel = new VerticalPanel();
panel.addStyleName("rhs-content-panel");
panel.getElement().getStyle().setMarginBottom(0, PX);
// header
panel.add(new ContentHeaderLabel("Log Viewer"));
panel.add(new ContentDescription("Log files of selected server"));
// toolbar
ToolStrip tools = new ToolStrip();
HTML label = new HTML(Console.CONSTANTS.commom_label_filter()+": ");