Starting with v2014 vol 1 (v14.1), it is much easier to accomplish this task via the built-in Context Menu -> Filter Row command. Please refer to the ASP.NET: GridView Context Menu (What's new in 14.1 ...
This example is based on recommendations from the E3940: How to use the ASPxPageControl control in a Full Screen mode (100% browser Width and Height) Code Central example. It illustrates how to use ...