The standard Web page components include a header, a footer, top-menu items, and
        left-menu content. 
Left Menu Content
            
            In different parts of an application, the left-menu content column contains:
- Context-specific information – such as a selected customer or agent
                        name.
 
- Context-specific menu options – relevant to either the chosen top menu item
                        or the context item. The background of the active menu is highlighted (CSS:
                        ul.submenu li.selected).
 
 
            Note: It is valid to have an empty left-content column.
            To set the active left menu item, override this
                    
BaseApplicationPage.java
                method:
protected abstract Class getActiveMenu();