'宣言 Public Class OptionalContentGroupList Inherits GrapeCity.Documents.Common.ObservableCollectionEx(Of OptionalContentGroup) Implements GrapeCity.Documents.Common.IObservableCollectionEx
public class OptionalContentGroupList : GrapeCity.Documents.Common.ObservableCollectionEx<OptionalContentGroup>, GrapeCity.Documents.Common.IObservableCollectionEx