Toolbar.notifyContextChange Method
        
 Notify a context change. 
 
         
        Parameters
        
            - contextCommands
            
 
            - 
                
Type: Array
ElementType: Command
The commands of the context. 
            - keepPosition
            
 
            - 
                
Type: Boolean
(optional) If provided, the toolbar will not slide after adding the new context commands.
Optional: True