text: ({
      handleClick: function(component, event, helper) {
          var btnClicked = event.getSource();         // the button
          var btnMessage = btnClicked.get("v.label"); // the button's label
          component.set("v.message", btnMessage);     // update our message
      },
          handleClick2: function(component, event, helper) {
          var newMessage = event.getSource().get("v.label"); // the button's label
          component.set("v.message", btnMessage);     // update our message
      },
          handleClick3: function(component, event, helper) {
          component.set("v.message", event.getSource().get("v.label"));     // update our message
      }
  })