Add a custom bookmarks MultiItem to the ToolbarControl
MultiItemBookmarks.vb
' Copyright 2012 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.
' 

Option Strict Off
Option Explicit On 

Imports ESRI.ArcGIS.Controls
Imports ESRI.ArcGIS.SystemUI
Imports ESRI.ArcGIS


Friend Class Form1
  Inherits System.Windows.Forms.Form
#Region "Windows Form Designer generated code "
  Public Sub New()
        MyBase.New()
        ESRI.ArcGIS.RuntimeManager.Bind(ESRI.ArcGIS.ProductCode.Engine)
    'This call is required by the Windows Form Designer.
    InitializeComponent()
  End Sub
  'Form overrides dispose to clean up the component list.
  Protected Overloads Overrides Sub Dispose(ByVal Disposing As Boolean)
        ESRI.ArcGIS.ADF.COMSupport.AOUninitialize.Shutdown()
        If Disposing Then
            If Not components Is Nothing Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(Disposing)
  End Sub
  'Required by the Windows Form Designer
  Private components As System.ComponentModel.IContainer
  Public WithEvents Label4 As System.Windows.Forms.Label
  Public WithEvents Label3 As System.Windows.Forms.Label
  Public WithEvents Label1 As System.Windows.Forms.Label
  Public WithEvents Label2 As System.Windows.Forms.Label
  'NOTE: The following procedure is required by the Windows Form Designer
  'It can be modified using the Windows Form Designer.
  'Do not modify it using the code editor.
    Friend WithEvents AxToolbarControl1 As ESRI.ArcGIS.Controls.AxToolbarControl
    Friend WithEvents AxMapControl1 As ESRI.ArcGIS.Controls.AxMapControl
    Friend WithEvents AxLicenseControl1 As ESRI.ArcGIS.Controls.AxLicenseControl
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(Form1))
        Me.Label4 = New System.Windows.Forms.Label
        Me.Label3 = New System.Windows.Forms.Label
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.AxToolbarControl1 = New ESRI.ArcGIS.Controls.AxToolbarControl
        Me.AxMapControl1 = New ESRI.ArcGIS.Controls.AxMapControl
        Me.AxLicenseControl1 = New ESRI.ArcGIS.Controls.AxLicenseControl
        CType(Me.AxToolbarControl1, System.ComponentModel.ISupportInitialize).BeginInit()
        CType(Me.AxMapControl1, System.ComponentModel.ISupportInitialize).BeginInit()
        CType(Me.AxLicenseControl1, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'Label4
        '
        Me.Label4.BackColor = System.Drawing.SystemColors.Control
        Me.Label4.Cursor = System.Windows.Forms.Cursors.Default
        Me.Label4.Font = New System.Drawing.Font("Arial", 8.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label4.ForeColor = System.Drawing.SystemColors.ControlText
        Me.Label4.Location = New System.Drawing.Point(480, 184)
        Me.Label4.Name = "Label4"
        Me.Label4.RightToLeft = System.Windows.Forms.RightToLeft.No
        Me.Label4.Size = New System.Drawing.Size(137, 49)
        Me.Label4.TabIndex = 4
        Me.Label4.Text = "Create a new bookmark based on the current extent of the focus map."
        '
        'Label3
        '
        Me.Label3.BackColor = System.Drawing.SystemColors.Control
        Me.Label3.Cursor = System.Windows.Forms.Cursors.Default
        Me.Label3.Font = New System.Drawing.Font("Arial", 8.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label3.ForeColor = System.Drawing.SystemColors.ControlText
        Me.Label3.Location = New System.Drawing.Point(480, 88)
        Me.Label3.Name = "Label3"
        Me.Label3.RightToLeft = System.Windows.Forms.RightToLeft.No
        Me.Label3.Size = New System.Drawing.Size(137, 41)
        Me.Label3.TabIndex = 3
        Me.Label3.Text = "Navigate around the data using the commands on the ToolbarControl."
        '
        'Label1
        '
        Me.Label1.BackColor = System.Drawing.SystemColors.Control
        Me.Label1.Cursor = System.Windows.Forms.Cursors.Default
        Me.Label1.Font = New System.Drawing.Font("Arial", 8.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label1.ForeColor = System.Drawing.SystemColors.ControlText
        Me.Label1.Location = New System.Drawing.Point(480, 136)
        Me.Label1.Name = "Label1"
        Me.Label1.RightToLeft = System.Windows.Forms.RightToLeft.No
        Me.Label1.Size = New System.Drawing.Size(137, 49)
        Me.Label1.TabIndex = 2
        Me.Label1.Text = "Zoom to any bookmarks listed in the spatial bookmark menu."
        '
        'Label2
        '
        Me.Label2.BackColor = System.Drawing.SystemColors.Control
        Me.Label2.Cursor = System.Windows.Forms.Cursors.Default
        Me.Label2.Font = New System.Drawing.Font("Arial", 8.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label2.ForeColor = System.Drawing.SystemColors.ControlText
        Me.Label2.Location = New System.Drawing.Point(480, 40)
        Me.Label2.Name = "Label2"
        Me.Label2.RightToLeft = System.Windows.Forms.RightToLeft.No
        Me.Label2.Size = New System.Drawing.Size(137, 40)
        Me.Label2.TabIndex = 1
        Me.Label2.Text = "Browse to a map document to load into the MapControl."
        '
        'AxToolbarControl1
        '
        Me.AxToolbarControl1.Location = New System.Drawing.Point(8, 8)
        Me.AxToolbarControl1.Name = "AxToolbarControl1"
        Me.AxToolbarControl1.OcxState = CType(resources.GetObject("AxToolbarControl1.OcxState"), System.Windows.Forms.AxHost.State)
        Me.AxToolbarControl1.Size = New System.Drawing.Size(608, 28)
        Me.AxToolbarControl1.TabIndex = 5
        '
        'AxMapControl1
        '
        Me.AxMapControl1.Location = New System.Drawing.Point(8, 40)
        Me.AxMapControl1.Name = "AxMapControl1"
        Me.AxMapControl1.OcxState = CType(resources.GetObject("AxMapControl1.OcxState"), System.Windows.Forms.AxHost.State)
        Me.AxMapControl1.Size = New System.Drawing.Size(464, 424)
        Me.AxMapControl1.TabIndex = 6
        '
        'AxLicenseControl1
        '
        Me.AxLicenseControl1.Enabled = True
        Me.AxLicenseControl1.Location = New System.Drawing.Point(416, 248)
        Me.AxLicenseControl1.Name = "AxLicenseControl1"
        Me.AxLicenseControl1.OcxState = CType(resources.GetObject("AxLicenseControl1.OcxState"), System.Windows.Forms.AxHost.State)
        Me.AxLicenseControl1.Size = New System.Drawing.Size(200, 50)
        Me.AxLicenseControl1.TabIndex = 7
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.BackColor = System.Drawing.SystemColors.Control
        Me.ClientSize = New System.Drawing.Size(629, 475)
        Me.Controls.Add(Me.AxLicenseControl1)
        Me.Controls.Add(Me.AxMapControl1)
        Me.Controls.Add(Me.AxToolbarControl1)
        Me.Controls.Add(Me.Label4)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.Label2)
        Me.Cursor = System.Windows.Forms.Cursors.Default
        Me.Font = New System.Drawing.Font("Arial", 8.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
        Me.Location = New System.Drawing.Point(3, 22)
        Me.MaximizeBox = False
        Me.MinimizeBox = False
        Me.Name = "Form1"
        Me.RightToLeft = System.Windows.Forms.RightToLeft.No
        Me.Text = "MultiItem Spatial Bookmarks"
        CType(Me.AxToolbarControl1, System.ComponentModel.ISupportInitialize).EndInit()
        CType(Me.AxMapControl1, System.ComponentModel.ISupportInitialize).EndInit()
        CType(Me.AxLicenseControl1, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub
#End Region 

    <STAThread()> _
    Shared Sub Main()

        'Load runtime 
        If Not RuntimeManager.Bind(ProductCode.Engine) Then
            If Not RuntimeManager.Bind(ProductCode.Desktop) Then
                MessageBox.Show("Unable to bind to ArcGIS runtime. Application will be shut down.")
                System.Environment.Exit(1) ' Force exit or other indication in the application
            End If
        End If

        Application.Run(New Form1())
    End Sub

  Private Sub Form1_Load(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MyBase.Load
    
    'Set buddy control
        AxToolbarControl1.SetBuddyControl(AxMapControl1)
    
    'Add command items to the ToolbarControl
        AxToolbarControl1.AddItem("esriControls.ControlsOpenDocCommand", -1, -1, False, 0, esriCommandStyles.esriCommandStyleIconAndText)
        AxToolbarControl1.AddItem("esriControls.ControlsMapZoomInTool", -1, -1, True, 0, esriCommandStyles.esriCommandStyleIconAndText)
        AxToolbarControl1.AddItem("esriControls.ControlsMapZoomOutTool", -1, -1, False, 0, esriCommandStyles.esriCommandStyleIconAndText)
        AxToolbarControl1.AddItem("esriControls.ControlsMapPanTool", -1, -1, False, 0, esriCommandStyles.esriCommandStyleIconAndText)
        AxToolbarControl1.AddItem("esriControls.ControlsMapFullExtentCommand", -1, -1, False, 0, esriCommandStyles.esriCommandStyleIconAndText)
    
    'Create a new ToolbarMenu
        Dim pToolbarMenu As IToolbarMenu2
        pToolbarMenu = New ToolbarMenuClass
    
    'Set a caption
        pToolbarMenu.Caption = "Spatial Bookmarks"
    'Add the custom command to the ToolbarMenu
        pToolbarMenu.AddItem(New CreateBookmarkCommand, , , False, esriCommandStyles.esriCommandStyleTextOnly)
    'Add the custom multiitem to the ToolbarMenu
        pToolbarMenu.AddMultiItem(New SpatialBookmarksMultiItem, , True, esriCommandStyles.esriCommandStyleTextOnly)
    
    'Add the menu item to the ToolbarControl
        AxToolbarControl1.AddItem(pToolbarMenu, -1, -1, True, 0, esriCommandStyles.esriCommandStyleMenuBar)
    
  End Sub
End Class