Problems in radgrid when switching from localhost to servername

[Ahmed]

Hello,
I've a radgrid which is working properly when I access the website using localhost i.e. localhost/mywebsite
when I use the server name (the same machine i.e. dev machine) devmachine/mywebsite  I got two problems
1. in the UI radgrid skin is changed mainly for the grouping header
2. getting js exception
in line:
 var d=h.tHead.rows;
in this method:
Telerik.Web.UI.Grid.getMultiHeaderCells=function(k){var c="MultiHeader";

exception is unable to get property 'rows' of undefined or null reference.

As I've multi header for this grid,

note everything is working without any errors using localhost/mywebsite.
I'm using VS2012, windows 8.1, IE 11

[Ahmed]

I fixed the problem, by removing the Display = false and replace it with Visible = false.

I found that there is problem of using this property and do multi level grouping, so the group header does not have a color for all the columns.