C# - Controls In A Telerik Control Not Accessible From .cs File?

I am using telerik controls in my c# asp.net project. I am trying to disable a div in a telerik navigation menu from the .cs file. For example:

if (Emp_Role == "1" || Emp_Role == "5")
{
DivLeave.Visible = true;
}

I try run the project I get this error:

CS0103: The name 'DivLeave' does not exist in the current context

Here is an example of the aspx code

<telerik:RadMenu runat="server" ID="RadMenu1" Skin="Sitefinity" OnClientItemOpened="itemOpened"
Width="670px" Height="26px" EnableShadows="true">
<Items>
<telerik:RadMenuItem Text="Expenses" PostBack="false">
<Items>
<telerik:RadMenuItem CssClass="Stores" Width="640px">
ItemTemplate>
<div id="DivLeave" class="Wrapper">
<h3>
Expense Management</h3>
</div>

If I place the div outside the telerik control it works fine.