.NET 4.x TabPage & WebBrowser - Visual Basic .NET

Public Class Form1
 
    Public Sub AddTab(ByRef URL As String, ByRef TabControl As TabControl)
        Dim NewBrowser As New CustomBrowser
        Dim NewTab As New TabPage
        NewBrowser.Tag = NewTab
        NewTab.Tag = NewBrowser
        TabControl.TabPages.Add(NewTab)
        NewTab.Controls.Add(NewBrowser)
        NewBrowser.Dock = DockStyle.Fill
        NewBrowser.Navigate(URL)
    End Sub
 
 
    Private Sub Foml_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        AddTab("about:blank", TabControl1)
    End Sub
 
    Private Sub btnForward_Click(sender As System.Object, e As System.EventArgs) Handles btnForward.Click
        Dim WB As CustomBrowser = Me.TabControl1.SelectedTab.Tag
        WB.GoForward()
    End Sub
 
    Private Sub btnBack_Click(sender As System.Object, e As System.EventArgs) Handles btnBack.Click
        Dim WB As CustomBrowser = Me.TabControl1.SelectedTab.Tag
        WB.GoBack()
    End Sub
    Private Sub btnReFresh_Click(sender As System.Object, e As System.EventArgs) Handles btnReFresh.Click
        Dim WB As CustomBrowser = Me.TabControl1.SelectedTab.Tag
        WB.Refresh()
    End Sub
 
    Private Sub btnStop_Click(sender As System.Object, e As System.EventArgs) Handles btnStop.Click
        Dim WB As CustomBrowser = Me.TabControl1.SelectedTab.Tag
        WB.Stop()
    End Sub
 
    Private Sub btnAddTab_Click(sender As System.Object, e As System.EventArgs) Handles btnAddTab.Click
        AddTab("about:blank", TabControl1)
    End Sub
 
    Private Sub cbGo_Click(sender As System.Object, e As System.EventArgs) Handles cbGo.Click
        Dim WB As CustomBrowser = Me.TabControl1.SelectedTab.Tag
        WB.Navigate(Me.cbURL.Text)
        cbURL.items.add(cbURL.Text)
    End Sub
 
    Private Sub TabControl1_SelectedIndexChanged(sender As Object, e As System.EventArgs) Handles TabControl1.SelectedIndexChanged
        Dim WB As CustomBrowser = Me.TabControl1.SelectedTab.Tag
        Me.cbURL.text = WB.Url.ToString
    End Sub
 
 
    Private Sub btnReMoveTab_Click(sender As System.Object, e As System.EventArgs) Handles btnReMoveTab.Click
        If TabControl1.TabPages.Count = 1 Then
            Me.Close()
        Else
            TabControl1.TabPages.Remove(TabControl1.SelectedTab)
        End If
    End Sub
 
    Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
        Me.Close()
    End Sub
End Class
 
Public Class CustomBrowser
    Inherits WebBrowser
    Public Sub New()
        Me.ScriptErrorsSuppressed = True
    End Sub
 
    Private Sub DocConpleted() Handles Me.DocumentCompleted
        Dim TP As TabPage = Me.Tag
        If Me.DocumentTitle.Length > 15 Then
            TP.Text = Me.DocumentTitle.Substring(0, 14) & "..."
        Else
            TP.Text = Me.DocumentTitle()
        End If
        Form1.cbURL.text = Me.Url.ToString
    End Sub
End Class