title: RadioButton inside Update Panel causing postback
body: <p>I am putting the following controls inside an update panel so that the whole page does not refresh. When clicking the button, the page does not refresh but when I try to change the radio button, the page refreshes and causes a full postback. Here is my code:</p>
  
  <pre><code>&lt;ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager" runat="Server" EnablePartialRendering="true" /&gt;
  &lt;asp:UpdatePanel ID="updatePanelToggle" runat="server"&gt;
      &lt;ContentTemplate&gt;
          &lt;asp:RadioButton ID="radioOn" AutoPostBack="true" runat="server" GroupName="toggle" Text="On" OnCheckedChanged="radioOn_CheckedChanged" /&gt;
          &lt;asp:RadioButton ID="radioOff" AutoPostBack="true" runat="server" GroupName="toggle" Text="Off" OnCheckedChanged="radioOff_CheckedChanged" /&gt;
          &lt;asp:Button ID="testButton" runat="server" OnClick="mybutton_click"/&gt;
      &lt;/ContentTemplate&gt;
  &lt;/asp:UpdatePanel&gt;
  </code></pre>