Recently used files—Command, MultiItem, and ComboBox
ToolbarRecentFiles.vb
' Copyright 2010 ESRI
' 
' All rights reserved under the copyright laws of the United States
' and applicable international laws, treaties, and conventions.
' 
' You may freely redistribute and use this sample code, with or
' without modification, provided you include the original copyright
' notice and use restrictions.
' 
' See the use restrictions.
' 

Imports ESRI.ArcGIS.ADF.CATIDs
Imports ESRI.ArcGIS.ADF.BaseClasses
Imports System.Runtime.InteropServices

<ComClass(ToolbarRecentFiles.ClassId, ToolbarRecentFiles.InterfaceId, ToolbarRecentFiles.EventsId), _
 ProgId("RecentFilesCommandsVB.ToolbarRecentFiles")> _
Public NotInheritable Class ToolbarRecentFiles
    Inherits BaseToolbar

#Region "COM Registration Function(s)"
    <ComRegisterFunction(), ComVisibleAttribute(False)> _
    Public Shared Sub RegisterFunction(ByVal registerType As Type)
        ' Required for ArcGIS Component Category Registrar support
        ArcGISCategoryRegistration(registerType)

        'Add any COM registration code after the ArcGISCategoryRegistration() call

    End Sub

    <ComUnregisterFunction(), ComVisibleAttribute(False)> _
    Public Shared Sub UnregisterFunction(ByVal registerType As Type)
        ' Required for ArcGIS Component Category Registrar support
        ArcGISCategoryUnregistration(registerType)

        'Add any COM unregistration code after the ArcGISCategoryUnregistration() call

    End Sub

#Region "ArcGIS Component Category Registrar generated code"
    ''' <summary>
    ''' Required method for ArcGIS Component Category registration -
    ''' Do not modify the contents of this method with the code editor.
    ''' </summary>
    Private Shared Sub ArcGISCategoryRegistration(ByVal registerType As Type)
        Dim regKey As String = String.Format("HKEY_CLASSES_ROOT\CLSID\{{{0}}}", registerType.GUID)
        MxCommandBars.Register(regKey)
        GMxCommandBars.Register(regKey)
        SxCommandBars.Register(regKey)

    End Sub
    ''' <summary>
    ''' Required method for ArcGIS Component Category unregistration -
    ''' Do not modify the contents of this method with the code editor.
    ''' </summary>
    Private Shared Sub ArcGISCategoryUnregistration(ByVal registerType As Type)
        Dim regKey As String = String.Format("HKEY_CLASSES_ROOT\CLSID\{{{0}}}", registerType.GUID)
        MxCommandBars.Unregister(regKey)
        GMxCommandBars.Unregister(regKey)
        SxCommandBars.Unregister(regKey)

    End Sub

#End Region
#End Region

#Region "COM GUIDs"
    ' These  GUIDs provide the COM identity for this class 
    ' and its COM interfaces. If you change them, existing 
    ' clients will no longer be able to access the class.
    Public Const ClassId As String = "2b29356a-bfb9-44e4-b72f-24f6beda0593"
    Public Const InterfaceId As String = "002a050d-161b-4693-8382-a46a41aaec0f"
    Public Const EventsId As String = "43c5dbe0-2dba-4835-b41d-e7abed563f41"
#End Region

  ' A creatable COM class must have a Public Sub New() 
  ' with no parameters, otherwise, the class will not be 
  ' registered in the COM registry and cannot be created 
  ' via CreateObject.
  Public Sub New()
    AddItem("{b1f38f88-c53f-4bdb-9c4d-c14070b12b98}") 'menu
    AddItem("RecentFilesCommandsVB.RecentFilesCombo")
  End Sub

  Public Overrides ReadOnly Property Caption() As String
    Get
      Return "Recent Files (VB.Net)"
    End Get
  End Property

  Public Overrides ReadOnly Property Name() As String
    Get
      Return "VBNETSamples_RecentFilesToolbar"
    End Get
  End Property
End Class