code: public void setValue(String newStyle) {
  
          for (UIObject ui : m_uis) {
              if (m_style != null) {
                  ui.removeStyleName(m_style);
              }
              if (newStyle != null) {
                  ui.addStyleName(newStyle);
              }
          }
          m_style = newStyle;
      }
docs: Removes the previous value of the style variable from all associated ui objects
  and adds the new value as a style name to all of them.<p>
  
  @param newStyle the new style name