Span Calling a radiobutton

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VB

ASP.NET

in my web project two radio buttons are called from span like a message box.Could someone explain how this span calls this radiobutton.i put my UI here

<span class="linktr" data-dialog-append="Form1" data-dialog="detailsPop" data-dialog-width="340" data-dialog-y="center+80 center" data-dialog-x="center center" data-modal="false">Edit</span>

                               <div id="pbDialog-detailsPop" class="pb-dialog">

                       <h3 class="tight">My List Status</h3>
                       <ul class="link-list section"  runat="server">
                           <li>
                               <asp:RadioButton ID="prRdBtn" runat="server" Text="Private" EnableViewState="true" Checked="true" GroupName="list" CausesValidation="False" /> 
                               Only you
                           </li>
                           <li><asp:RadioButton ID="puRdBtn" runat="server" Text="Public" EnableViewState="True" Checked="false" GroupName="list" CausesValidation="False" /> 
                               Anyone
                           </li>
                           </ul>
                       <dl>

                           <dt><label>Comments:</label> </dt>
                            <dd><textarea id="listComm" cols="33" maxlength="250" rows="4" runat="server"/></dd>
                       </dl>
                       <asp:Button ID="btnUp" runat="server" CssClass="button1 bottom-space" Text="Update" />
                   </div>.<pre lang="HTML">