columns.Bound(e => e.City)
                .ClientTemplate("#=FirstName# #=LastName#")
                .Filterable(filterable => filterable.UI("nameFilter"))
                .Width(200);
..
function nameFilter(element) {
          var textbox = element.kendoTextBox({
            change: function(e) {
              var value = e.sender.value();
              var dataSource = $("#grid").data("kendoGrid").dataSource;
              var filter = { logic: "or", filters: [] };
              filter.filters.push({ field: "FirstName", operator: "eq", value: value }, { field: "LastName", operator: "eq", value: value });
              if (value) {
                dataSource.filter(filter);
              }
              else {
                dataSource.filter({});
              }
            }
          })
          }