<desc>Returns the id of the menu if the object has an open menu. This is usually the id of the menu symbol (symbol) unless <funclink>CreateMenu</funclink> was used to explicitly use a differing menu id in idMenuID.</desc>
<remark>A return value of <code>nil</code> means that no valid symbol could be determined. This may happen e.g. if no object pointer was passed during a global call to the function. Engine defined menus such as Buy, Sell, etc. never return valid ids.</remark>