When binding a RadGrid (client-side) containing a GridTemplateColumn as described in various Telerik posts, binding for that column seems to work for the first few rows, then seems to stop producing the markup for the asp:Label within the ItemTemplate. Therefore, the remaining items in the grid are empty for that column. I have isolated the issue in the attached test files and provided a screenshot of the result.
Unfortunately the described behavior is rather expected. Client side biding of RadGrid does not support ItemTemplate. You can use ClientItemTemplate for such scenarios. Please review the following demo: http://demos.telerik.com/aspnet-ajax/grid/examples/data-binding/client-side/client-item-template/defaultcs.aspx
Also, I'm using assembly version 2012.3.1016.40
Here is a screenshot of the attached demo page result.