Bootstrap modal - popup window not showing - twitter-bootstrap-3

Question

I am using following example
http://www.bootply.com/59864
But when I click on the button which triggers the pop up, background gets darker but window doesn't show. Any idea what's causing this? I am using bootstrap 3.2.0
<%# Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="CreateWorkbook.aspx.cs" Inherits="CreateWorkbook" %>
<asp:Content ID="Content0" ContentPlaceHolderID="head" runat="Server">
<script>
$(function () {
$('#myFormSubmit').click(function (e) {
e.preventDefault();
alert($('#myField').val());
/*
$.post('http://path/to/post',
$('#myForm').serialize(),
function(data, status, xhr){
// do something here with response;
});
*/
});
});
</script>
</asp:Content>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<div class="row">
<div class="col-md-12 col-xs-12" style="margin-top: 10px">
<a data-toggle="modal" href="#myModal" role="button" class="btn btn-info btn-lg"><span class="glyphicon glyphicon-plus-sign">
</span>Add questions</a>
</div>
</div>
<div class="list-group col-md-8" style="margin-top:20px"> Questions list Q1: Name Q2: Location Q3: Outcome Q4: Next meeting date </div>
<div id="myModal" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h3 id="myModalLabel">Modal header</h3>
</div>
<div class="modal-body">
<form id="myForm" method="post">
<input type="hidden" value="hello" id="myField">
<button id="myFormSubmit" type="submit">Submit</button>
</form>
</div>
<div class="modal-footer">
<button class="btn" data-dismiss="modal" aria-hidden="true">Close</button>
<button class="btn btn-primary">Save changes</button>
</div>
</div>
</asp:Content>

Answer 1

The working example is based on Bootstrap 2.3.1, if you are importing Bootstrap 3.3.0, then a working example could be: http://bootply.com/va3EnHE0MJ