I have finally found a solution using JQuery.  I still think there has to be a better way of getting a page element then going through a list of elements by tag name.  Somehow there should be a way to get the DNN hashed name of the element via a dnn dom function.

<script type="text/javascript">
     $(document).ready(function () {

           // Do stuff when DOM is ready

         // Initialy hide the cmdReport Button
         var linkList = dnn.dom.getByTagName("a");        // HtmlCollection
         var theLink = linkList["cmdReport"];
         var linkJQName = "#" + theLink.id;
         $(linkJQName).hide();
     });

function radGridCustomerPool_setReportLink(sender, eventArgs)
     {
         var linkList   = dnn.dom.getByTagName("a");        // HtmlCollection
         var theLink    = linkList["cmdReport"];
         var linkJQName = "#" + theLink.id;

         var selected = eventArgs.get_tableView().get_selectedItems();
         if (selected.length > 0)
         {
             $(linkJQName).show();
         }
         else
         {
             $(linkJQName).hide();
         }
     }
</script>


<asp:LinkButton type="button" CssClass="CommandButton" ID="cmdReport" runat="server" name="cmdReport" Enabled="true"
                text="Confirm Selected Customers" OnClick="cmdReport_Click"></asp:LinkButton>

I think I've beat this to death.  In the end the problem I'm having is that Firefox will not disable an ASP:LinkButton yet in IE setting the disabled attribute to true/false works fine.  Go figure!  So to achieve cross browser support the best way to disable an ASP:LinkButton is to remove and add back its "href" attribute via jQuery script.


         // Initialy hide the cmdReport Button
         var linkList = dnn.dom.getByTagName("a");     // HtmlCollection
         var dnnLink = linkList["cmdReport"];          // The link DNN object
         var dnnName = "#" + dnnLink.id;               // The hashed dnn html ID
         var jqLink = $(dnnName);                      // The link jQuery object
 
         // To disable an ASP:LinkButton remove the href attribute.
         // Save it and put it back to enable again.
         // These do not work in Firefox but do in IE: jqLink.attr("disabled", true);  jqLink.attr("enabled", false);
         var linkHref = jqLink.attr("href");
         jqLink.removeAttr("href");         // Disable
         jqLink.attrib("href", linkHref);   // Enable