If you are using Xceed Grid for .NET 3.0 and above, you can simply use the CellEditorManager class to wrap a Xceed.Editors.WinButton or you can even wrap a standard Microsoft button.
You will find all the details you need here :http://doc.xceedsoft.com/products/gridNET/doc/sources/celleditormanagers_and_cellviewermanagers.htm
If you are using a older version, you can refer to this
Imported from legacy forums. Posted by Matt (had 2914 views)