Program to add group

[Lan]

in GGC, I want to use code to group the grid by column "field_type".
I used code like:
oGrid.TableDescriptor.GroupedColumns.Add("field_type");

The GGC is grouped by "field_type" and the "field_type" displays in the "group drop area".
The problem is:
I can''t use "drag-drop" method to un-group the "field_name"

Any Idea?
Thanks,

Lan

[Administrator]

You discussed "field_type" except for the last mention where you wrote "field_name". Did you do that on purpose?

Do you see any exceptions thrown when you try to drag the column off the drop area?

I really do not know what might be going on here. Here is a little sample that worked for me.
http://www.syncfusion.com/Support/user/uploads/GGC_Group_fd86c632.zip

If you can upload a sample project showing the problem, we can try to debug it here.