Make a DropdownList visible on click of a RadioButton
<p>When I perform a <code>radiobuttonclick</code>, I want to set a <code>dropdownlist</code> to become visible. The <code>radiobutton</code> and <code>dropdownlist</code> are within the same <code>datagrid</code>. I am not sure how to do this.</p>

<pre><code>&lt;asp:UpdatePanel ID="updatepanel" UpdateMode="conditional" runat="server"&gt;
    &lt;ContentTemplate&gt;
        &lt;asp:DataGrid ID="DataGrid" AutoGenerateColumns = "false" CssClass="objectSubTitle" ItemStyle-Wrap="true" runat="server" OnItemCommand="handler" &gt;&lt;Columns&gt;
            &lt;asp:TemplateColumn&gt;
                &lt;ItemTemplate&gt;
                   &lt;asp:RadioButton ID ="RadioButton1" Text="Yes" GroupName="creatingNewCard" OnCheckedChanged="RadioButtonYes" AutoPostBack="True" runat="server" /&gt;
                  &lt;asp:DropDownList ID="DropDownList1"  Visible="false" runat="server"/&gt;
                &lt;/ItemTemplate&gt;
            &lt;/asp:TemplateColumn&gt;
</code></pre>
