How do I use buttons outside TabControl in VB.net

sorry if the title of my question was wrong.

I am using Visual Studio 2019

My problem is using a button that is not inside TabControl and like umm... The button outside the TabControl should work on selected tab only. But it doesn't, I tried doing like this:

WebBrowser1.GoBack()

There was no error at all, but when I debug it and press the button, it shows me the code and visual studio shows me something message. Anyways, I don't remember it.

Please help me, advance thanks to the helpers.

Edit:

Hello, people who don't understand my question correctly, I am going to show more information.

1. The error is when I press the button, it takes me to visual studio 2019 and then shows the code and shows some error called "Exception Unhandled" and I copied the error details:

System.Runtime.InteropServices.COMException HResult=0x80004005
Message=Error HRESULT E_FAIL has been returned from a call to a COM component. Source=Interop.SHDocVw StackTrace: at SHDocVw.IWebBrowser2.GoBack() at AxSHDocVw.AxWebBrowser.GoBack()
at Browser.Browser.Button1_Click(Object sender, EventArgs e) in C:\Users\Admin\source\repos\Browser\Browser\Browser.vb:line 20 at System.Windows.Forms.Control.OnClick(EventArgs e) at System.Windows.Forms.Button.OnClick(EventArgs e) at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ButtonBase.WndProc(Message& m) at System.Windows.Forms.Button.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData) at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun() at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel() at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine) at Browser.My.MyApplication.Main(String[] Args) in :line 81

2. Someone answered my question, but that was not the answer I expected. That he gave me the code that runs on each every tab that I should retype again and again, the code I expected is that button code works on every tab. If my question was still not understandable, then here's the whole code:

Public Class Browser

Private Sub Button6_Click(sender As Object, e As EventArgs)
    Form1.TabControl1.TabPages.Remove(Form1.TabControl1.SelectedTab)
End Sub

Private Sub NewTabToolStripMenuItem_Click(sender As Object, e As EventArgs) Handles NewTabToolStripMenuItem.Click
    Dim t As New TabPage
    Dim tab As New Form1
    tab.Show()
    tab.Dock = DockStyle.Fill
    tab.TopLevel = False
    t.Controls.Add(tab)
    Form1.TabControl1.TabPages.Add(t)
    Form1.TabControl1.SelectTab(t)
    AxWebBrowser1.Navigate("https://www.google.com")
End Sub

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    AxWebBrowser1.GoBack()
End Sub

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
    AxWebBrowser1.GoForward()
End Sub

Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
    AxWebBrowser1.Navigate("https://www.google.com")
End Sub

Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
    AxWebBrowser1.Refresh()
End Sub

Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
    AxWebBrowser1.Navigate(ComboBox1.Text)
End Sub

Private Sub CloseTabToolStripMenuItem_Click(sender As Object, e As EventArgs) Handles CloseTabToolStripMenuItem.Click
    Form1.TabControl1.TabPages.Remove(Form1.TabControl1.SelectedTab)
    Me.Close()
End Sub

Private Sub ComboBox1_KeyDown(sender As Object, e As KeyEventArgs) Handles ComboBox1.KeyDown
    If e.KeyCode = Keys.Enter Then
        Button3.PerformClick()
    End If
End Sub

Private Sub ContextMenuStrip1_Opening(sender As Object, e As System.ComponentModel.CancelEventArgs) Handles ContextMenuStrip1.Opening
    ContextMenuStrip1.Show(Button6, 0, y:=Button6.Height)
End Sub
End Class

From the official documentation of Microsoft, I guess you wanted similar to .SelectedTab = TabNum, an example's shown below:

Private Sub Button_Click(sender As Object, e As EventArgs) Handles Button1.Click
    If TabControl1.SelectedTab Is TabPage1 ' choose your required statement
        SpecificActivityForPage1() ' your code

    Else If TabControl1.SelectedTab Is TabPage2
        SpecificActivityForPage2() ' your code
    Else
        ' something else...
    End If
End Sub

This should work for you. If it doesn't, please specify your error message thrown by the IDE.