Control Id Doesnot Exist in Masterpage??

Hi to all Advance thanks, i have set control in masterpage...if i call that control id it doesnt exit..please give the solution...i have shown my  

<div id="Menu_AdminRights" runat="server" class="clear hideSkiplink"><asp:Menu ID="NavigationMenu" runat="server" CssClass="menu" EnableViewState="false"  IncludeStyleBlock="false" Orientation="Horizontal"><Items><asp:MenuItem NavigateUrl="~/About.aspx" Text="About"/>--%><asp:MenuItem NavigateUrl="~/Page1.aspx" Text="Login"/><asp:MenuItem NavigateUrl="~/Page2.aspx" Text="DealerMenu"/><asp:MenuItem NavigateUrl="~/Page3.aspx" Text="SchoolMenu"/></Items></asp:Menu></div><div id="Menu_UserRights" runat="server" class="clear hideSkiplink"><asp:Menu ID="NavigationMenu" runat="server" CssClass="menu" EnableViewState="false"  IncludeStyleBlock="false" Orientation="Horizontal"><Items><asp:MenuItem NavigateUrl="~/About.aspx" Text="About"/>--%><asp:MenuItem NavigateUrl="~/Page2.aspx" Text="DealerMenu"/></Items></asp:Menu></div>


//siteMaster.cs
 if (Session["UserType"] != null)
        {
            if (Session["UserType"].ToString() == "1")
            {
				//NavigationMenu.Visible=true;     //NavigationMenu does not exist in the current context
                Menu_AdminRights.Visible = true;    //Error 'Menu_AdminRights' does not exist in the current context
				//pnl_AdminRights.Visible=true;     //Error 'pnl_AdminRights' does not exist in the current context

            }
            else
            {
                Menu_UserRights.Visible = true;
            }

        }
		
//siteMaster
<asp:panel id="pnl_AdminRights" runat="server"><div id="Menu_AdminRights" runat="server" class="clear hideSkiplink"><asp:Menu ID="NavigationMenu" runat="server" CssClass="menu" EnableViewState="false"  IncludeStyleBlock="false" Orientation="Horizontal"><Items><asp:MenuItem NavigateUrl="~/About.aspx" Text="About"/>--%><asp:MenuItem NavigateUrl="~/Page1.aspx" Text="Login"/><asp:MenuItem NavigateUrl="~/Page2.aspx" Text="DealerMenu"/><asp:MenuItem NavigateUrl="~/Page3.aspx" Text="SchoolMenu"/></Items></asp:Menu></div></asp:panel>

code please see