Configure The Filtering Mode

RadGridView has two filtering modes as described in this article.

To enable the popup filtering mode, set RadGridView’s FilteringMode property to Popup or do not set anything, since this is the standard default filtering mode.

<telerik:RadGridView FilteringMode="Popup" /> 
Popup Filtering Mode

Telerik Silverlight DataGrid filtering basic 01

Filter Row Mode

To enable the custom filter row mode, set RadGridView’s FilteringMode property to FilterRow.

<telerik:RadGridView FilteringMode="FilterRow" /> 

Popup Filtering Mode

Telerik Silverlight DataGrid filtering basic 02

In this article