FormColumns are only available when EditFormType is GridEditFormType.AutoGenerated. These are the container controls for each edit-form-column. You cna find the edit controls in these containers. You should not remove any controls from this containers.

public Control[] FormColumns { get; }

Public ReadOnly Property FormColumns As Control()
	Get

public:
property array<Control^>^ FormColumns {
	array<Control^>^ get ();
}

member FormColumns : Control[] with get