how can I get active tab back after Postback Event for Coallapsible tab i.e. Accordion
<div id="accordion" class="panel-group" style="font-size: large; font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif">
<div class="panel panel-red">
<div class="panel-heading">
<a data-toggle="collapse" data-parent="#accordion" href="#collapseOne" style="display: block; color: white; font-weight: bold; text-decoration: underline">#Sponsor Details **</a>
</div>
<div id="collapseOne" class="panel-collapse collapse">
<div class="panel-body">
<div class="row" style="text-align: center">
<div class="col-md-4">
<asp:Label ForeColor="Black" ID="Label14" runat="server" Text="Sponsor A/c No."></asp:Label><br />
<div class="input-icon">
<i class="fa fa-user-plus"></i>
<asp:TextBox ID="txtSpAcno" AutoPostBack="true" MaxLength="10" ForeColor="#BF4346" Font-Bold="true" Font-Size="Medium" runat="server" CssClass="form-control" OnTextChanged="txtSpAcno_TextChanged"></asp:TextBox>
</div>
</div>
<div class="col-md-4">
<asp:Label ForeColor="Black" ID="Label16" runat="server" Text="Sponsor BC No."></asp:Label><br />
<asp:TextBox ID="txtSPBCno" ReadOnly="true" ForeColor="#BF4346" Font-Bold="true" Font-Size="Medium" runat="server" CssClass="form-control"></asp:TextBox>
</div>
<div class="col-md-4">
<asp:Label ForeColor="Black" ID="Label15" runat="server" Text="Sponsor Name"></asp:Label><br />
<div class="input-icon">
<i class="fa fa-user"></i>
<asp:TextBox ID="txtSPName" ReadOnly="true" ForeColor="#BF4346" Font-Bold="true" Font-Size="Medium" runat="server" CssClass="form-control"></asp:TextBox>
</div>
</div>
<div class="col-md-4 col-md-offset-4">
<asp:Label ForeColor="Black" ID="Label17" runat="server" Text="Left/Right Team"></asp:Label><br />
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-angle-double-left"></i></span>
<span class="input-group-addon"><i class="fa fa-angle-double-right"></i></span>
<asp:DropDownList ID="drpPosition" ForeColor="#BF4346" Font-Bold="true" Font-Size="Medium" runat="server" CssClass="form-control">
<asp:ListItem Value="">Select Team</asp:ListItem>
<asp:ListItem Value="Left">Left Side</asp:ListItem>
<asp:ListItem Value="Right">Right Side</asp:ListItem>
</asp:DropDownList>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="panel panel-blue">
<div class="panel-heading">
<a data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" style="display: block; color: white; font-weight: bold; text-decoration: underline">#Member Details **</a>
</div>
<div id="collapseTwo" class="panel-collapse collapse">
<div class="panel-body">
<div class="row" style="text-align: center">
<div class="col-md-4">
<asp:Label ForeColor="Black" ID="Label2" runat="server" Text="Mobile No."></asp:Label><br />
<div class="input-icon">
<i class="fa fa-mobile"></i>
<asp:TextBox ID="txtMobile" AutoPostBack="true" MaxLength="10" ForeColor="#2A73D4" Font-Bold="true" Font-Size="Medium" runat="server" CssClass="form-control"></asp:TextBox>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="panel panel-green">
<div class="panel-heading">
<a data-toggle="collapse" data-parent="#accordion" href="#collapseThree" style="display: block; color: white; font-weight: bold; text-decoration: underline">#Account Details</a>
</div>
<div id="collapseThree" class="panel-collapse collapse">
<div class="panel-body">
</div>
</div>
</div>
<div class="panel panel-pink">
<div class="panel-heading">
<a data-toggle="collapse" data-parent="#accordion" href="#collapseFour" style="display: block; color: white; font-weight: bold; text-decoration: underline">#Login Details (Check Terms & Conditions) **</a>
</div>
<div id="collapseFour" class="panel-collapse collapse">
<div class="panel-body">
</div>
</div>
</div>
<br />
<div class="row">
<div class="col-md-8">
<h3 class="hs_heading">
<asp:LinkButton ID="LinkError" runat="server" Text="" Font-Bold="true"></asp:LinkButton>
</h3>
</div>
<div class="col-md-3" style="text-align: center">
<%--<button type="button" data-target="#modal-alert" data-toggle="modal" class="btn btn-blue">View Demo</button>--%>
<button id="btnSubmit" runat="server" onserverclick="btnSubmit_ServerClick" class="btn btn-success">Success <i class="fa fa-rocket"></i></button>
</div>
</div>
</div>
