title: Select2 is being duplicated in my component
body: <p>I am using the jquery plugin in my pages e until now i have not any problem with it. the problem happend when i am tring using the select2 with a ascx page. More description of the problem below.</p>
  
  <p>I have a aspx that i am using a component ascx to show somethings:</p>
  
  <pre><code>&lt;%@ Page Title="" Language="C#" 
     MaintainScrollPositionOnPostback="True" AutoEventWireup="true" 
     CodeBehind="Register.aspx.cs" Inherits="Organization.Register" %&gt;
  &lt;%@ Register Src="../DialogUF.ascx" TagPrefix="comp" TagName="DialogUF" %&gt;
  
  &lt;asp:Content runat="server"&gt;
       &lt;asp:LinkButton ID="btnUF" runat="server" CausesValidation="False"  
            OnClick="btnUF_Click"&gt;aqui&lt;/asp:LinkButton&gt;
       &lt;Comp:DialogUF ID="dlgUF" runat="server" /&gt;
  &lt;/asp:Content&gt;
  </code></pre>
  
  <p>In My code behind:</p>
  
  <pre><code>protected void btnUF_Click(object sender, EventArgs e)
      {
          dlgUF.Visible = true;
      }
  </code></pre>
  
  <p>Mas ascx:</p>
  
  <pre><code>&lt;%@ Control Language="C#" AutoEventWireup="true" CodeBehind="DialogUF.ascx.cs"
      Inherits="Organization.DialogUF" %&gt;
  
  ...
  &lt;asp:Panel ID="pnlBody" runat="server"&gt;
  &lt;fieldset class="grid-form"&gt;
      &lt;div data-row-span="12"&gt;
          &lt;div data-field-span="6"&gt;
              &lt;asp:Label runat="server" AssociatedControlID="ddlState"&gt;UF 
              &lt;span class="text-danger"&gt;(*)&lt;/span&gt;:&lt;/asp:Label&gt;
              &lt;asp:DropDownList ID="ddlState" runat="server"
                  CssClass="form-control" 
                  OnSelectedIndexChanged="ddState_SelectedIndexChanged"
                  AutoPostBack="True"&gt;
              &lt;/asp:DropDownList&gt;
          &lt;/div&gt;
      &lt;/div&gt;
  &lt;/fieldset&gt;
  ...
  &lt;script type="text/javascript"&gt;
          $(document).ready(function () {
              $("#&lt;%= ddlState.ClientID %&gt;").select2();
             });
  &lt;/script&gt;
  &lt;/asp:Panel&gt;
  </code></pre>
  
  <p><a href="http://i.stack.imgur.com/sdEds.png" rel="nofollow">Image of select2 duplicated</a></p>