'宣言
 
Public MustInherit Class ComboEditorBase
    (Of T As ComboEditorItemBase(Of TControl),
     TControl As FrameworkElement) 
   Inherits System.Windows.Controls.Control
   Implements Infragistics.IProvideDataItems(Of T), Infragistics.IProvidePropertyPersistenceSettings 
            public abstract class ComboEditorBase<T,TControl> : System.Windows.Controls.Control, Infragistics.IProvideDataItems<T>, Infragistics.IProvidePropertyPersistenceSettings where T: ComboEditorItemBase<TControl> where TControl: FrameworkElement