[Solved]-Highcharts: Add a custom image button-Highcharts

Finally, I figured it out like this. May be it will help others.

function callback($this){
    var img = $this.renderer.image('images/zoom_icon.png',$this.chartWidth-40,5,40,12); 
    img.add(); 
    img.css({'cursor':'pointer'});
    img.attr({'title':'Pop out chart'});
    img.on('click',function(){
              // prcessing after image is clicked
    });

 }

new Highcharts.Chart(charts.params,callback);

// where charts.params is object which contains options for chart