Set active Bootstrap Tab from VB Code Behind

I'm using a Bootstrap NAV panel with NAV panes and I have a 2 part question:

1. How can I set the active tab-pane from VB code behind?

2. When my page loads, I see the 3 tabs and the 1st tab is active, but the contents of the tab are not seen until I click on the 2nd or 3rd tab??

Code is attached:

 <link href="Content/bootstrap.css" rel="stylesheet" />
    <script src="Scripts/jquery-2.1.3.js"></script>
    <script src="Scripts/bootstrap.js"></script>

    <div class="container">
        <div class="panel panel-info">
            <div class="panel-heading">
                <ul class="nav nav-tabs">
                    <li class="nav active"><a href="#A" data-toggle="tab">Tab A</a></li>
                    <li class="nav"><a href="#B" data-toggle="tab">Tab B</a></li>
                    <li class="nav"><a href="#C" data-toggle="tab">Tab C</a></li>
                </ul>
            </div>
            <div class="panel-body">
                <!-- Tab panes -->
                <div class="tab-content">
                    <div class="tab-pane fade" id="A">Content inside tab A</div>
                    <div class="tab-pane fade" id="B">Content inside tab B</div>
                    <div class="tab-pane fade" id="C">Content inside tab C</div>
                </div>
            </div>
            </div>
    </div>

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