How to enable editing in a group row so it is possible to change child cell values

This example illustrates how to show an editor in a group row under a corresponding column. The editor corresponds to an in-place editor used in the column.

To invoke the group editor click the group row once or twice based upon the GroupEditProvider.SingleClick property. Then, you can enter any value in this editor. To apply this value to child cells and close the editor you should either press the Enter key or force the editor to lose focus. To discard changes press the Esc key when the group editor is active.
Also, you can provide end-users with a visual effect pointing that he/she can invoke the group editor for a group row located under the mouse pointer. For this, enable the GroupEditProvider.ShowGroupEditorOnMouseHover property.