title: update panel not working
body: <p>i am having two list box which perform add remove item functionality which are controlled by four buttons and o  each button click there happen to be post back but i don't want it to be flicker for which i am using update panel like this but it still made post back wats wrong with this explain me this</p>
  
  <pre><code>&lt;asp:UpdatePanel ID="button" runat="server" UpdateMode="Always"&gt;
      &lt;ContentTemplate&gt;
          &lt;asp:Button ID="ButtonAdd" runat="server" Text="&gt;" OnClick="ButtonAdd_Click"  Width="50px"/&gt;&lt;br /&gt;
          &lt;asp:Button ID="ButtonRemove" runat="server" Text="&lt;" OnClick="ButtonRemove_Click" Width="50px"/&gt;&lt;br /&gt;
          &lt;asp:Button ID="ButtonAddAll" runat="server" Text ="&gt;&gt;&gt;" OnClick="ButtonAddAll_Click" Width="50px"/&gt;&lt;br /&gt;    
          &lt;asp:Button ID="ButtonRemoveAll" runat="server" Text ="&lt;&lt;&lt;" OnClick="ButtonRemoveAll_Click" Width="50px"/&gt;
      &lt;/ContentTemplate&gt;
  &lt;/asp:UpdatePanel&gt;
  </code></pre>