For instance, a RadTreeView can be embedded in the Grid as a filtering control. The items in the RadTreeView (the data source of the tree view) should be generated based on the Data bound to the GridDataColumn in question. More additional code will be needed for handling the selection of the TreeView and applying the filter on the Grid accordingly.
Note that this is just an idea to consider as the desired functionality is not exposed as a built-in feature of the RadGrid. The suggested approach is not tested and its implementation could be quite tricky and for sure requires investing a lot of time and effort in custom coding.
I hope you will find this information useful.
Kind regards,
Doncho
Progress Telerik
Heads up! Telerik UI for ASP.NET AJAX versions for .NET 3.5 and 4.0 are retired. Progress will continue shipping assemblies compatible with .NET 4.5 and later. See whether this affects your apps in this article.