Finally I ended up to not to go with igDialog instead I used jquery dialogbox.

I found that jquery dialogbox is having same issue but there is  a solution. On button click I have removed the script tag by finding it from dialogbox before opening it and everything works well.

$("#btnOpen").click(function () {

         $("#DivPickInstr").find("script").remove(); //Did the trick hope this help some one 🙂
         $("#DivPickInstr").dialog({
               model: true,
               height: 650,
               width: 950,
               resizable: false,
         });

});

Thank you,
Dharmendra Mistry