自定义控件强制重绘，请教版主，谢谢！！！

Question

试着写了一个Control，在里面有一个类，我想在类里面重绘控件Control，但里面Invalidate()和   Refresh都不能用，

类CustomCollectionEditor：

Imports System.Windows.Forms
Imports System.Collections
Imports System.ComponentModel.Design
Public Class CustomCollectionEditor
    Inherits System.Drawing.Design.UITypeEditor
    Public Delegate Sub CollectionChangedEventHandler(sender As Object, instance As Object, value As Object)
    Public Event CollectionChanged As CollectionChangedEventHandler
    Private _context As ITypeDescriptorContext
    Private edSvc As IWindowsFormsEditorService = Nothing
    Public Sub New()
    End Sub
    Public Overrides Function EditValue(context As ITypeDescriptorContext, provider As IServiceProvider, value As Object) As Object
        If context IsNot Nothing AndAlso context.Instance IsNot Nothing AndAlso provider IsNot Nothing Then
            Dim originalValue As Object = value
            _context = context
            edSvc = DirectCast(provider.GetService(GetType(IWindowsFormsEditorService)), IWindowsFormsEditorService)
            If edSvc IsNot Nothing Then
                AddHandler 编辑.ItemAdded, New 编辑.InstanceEventHandler(AddressOf ItemAdded)
                AddHandler 编辑.ItemRemoved, New 编辑.InstanceEventHandler(AddressOf ItemRemoved)
                编辑.newval = value
                编辑.pg_PropGrid.SelectedObject = Nothing
                编辑.Collection = DirectCast(value, System.Collections.CollectionBase)
                context.OnComponentChanging()
                If edSvc.ShowDialog(编辑) = DialogResult.OK Then
                    OnCollectionChanged(context.Instance, value)
                    context.OnComponentChanged()
                    '我想在这里重绘控件Control()，求教该如何让做，谢谢！！！
                End If
            End If
        End If
        Return value
    End Function