how updatemenus buttons bind my own event function

[hackedbyxx]

updatemenus: [{
                      x: 0.5,
                      y: 0,
                      yanchor: "top",
                      xanchor: "center",
                      showactive: false,
                      direction: "left",
                      type: "buttons",
                      pad: {"t": 150, "r": 10},
                      buttons: [{
                        method: "animate",
                        args: [null, {
                          fromcurrent: true,
                          transition: {
                            duration: 0,
                          },
                          frame: {
                            duration: 100,
                            redraw: false
                          }
                        }],
                        label: "Play"
                      }, {
                        method: "animate",
                        args: [
                          [null],
                          {
                            mode: "immediate",
                            transition: {
                              duration: 0
                            },
                            frame: {
                              duration: 0,
                              redraw: false
                            }
                          }
                        ],
                        label: "Pause"
                      }]
                    }]

like this when i start i want to play music and pause to pause play,it seems not support this, is there some way to reach that?