Shows tooltip of the item with 
id.
    tooltipShow(id, [event], [forceRefresh])
    
    
        | id | string, id of the toolbar item | 
    
        | event | DOM event, event object (optional) | 
    
        | forceRefresh | boolean, indicates if to force tooltip show (optional) | 
    
 
Returns 
undefined.
Description
The item must exist in the 
.items array of the toolbar. The toolbar item is
identified by the 
.id property.
If you have toolbar defined in the following way:
You can show toolbar item's tooltip: