'宣言 Public Class C1ComboColumnCollection Inherits C1.Web.Wijmo.Controls.Base.Collections.C1ObservableItemCollection(Of C1ComboBox,C1ComboBoxColumn)
public class C1ComboColumnCollection : C1.Web.Wijmo.Controls.Base.Collections.C1ObservableItemCollection<C1ComboBox,C1ComboBoxColumn>