Add button with send button

[vishal.mar...@gmail.com]

Hi. I want to add extra button with send button i added but not getting how to add their label..

composeView.addButton({
             
            title: "My Nifty Button!",
            iconClass: "am",
        
            iconUrl: 'https://lh5.googleusercontent.com/itq66nh65lfCick8cJ-OPuqZ8OUDTIxjCc25dkc4WUT1JG8XG3z6-eboCu63_uDXSqMnLRdlvQ=s128-h128-e365',
            onClick: function(event) {
             
         alert('checkt');
              
            },
        });


thts my code please tell how to add label

[vishal.mar...@gmail.com]

Please tell how to add label in button??asap