Excel - How to create button upon Workbook_Open event - vba

Question

I'm trying to make an Excel Add-In to create a simple button when any workbook is opened, but I'm getting
Object variable or With Block variable not set
I think this is happening because technically there is no 'ActiveWorkbook' yet.
First thing I want to do is delete any buttons currently on the sheet. Then I want to place a button.
Anyone know how to make that happen?
Code
Private Sub Workbook_Open()
ActiveWorkbook.ActiveSheet.Buttons.Delete
Dim CommandButton As Button
Set CommandButton = ActiveWorkbook.ActiveSheet.Buttons.Add(1200, 100, 200, 75)
With CommandButton
.OnAction = "Test_Press"
.Caption = "Press for Test"
.Name = "Test"
End With
End Sub
I then have a Private Sub Test_Press() to display a MsgBox. The button is not being created though.

Answer 1

Credit goes to http://www.jkp-ads.com/Articles/FixLinks2UDF.asp
Note: I have another module I didn't post below, which houses the macro Project_Count I tied to the button I place on the workbook only if the workbook name is TT_GO_ExceptionReport
I also have a VBScript that downloads the Add-In, places it in the users addin folder, and installs it. If you want to know how to do that, leave a comment.
Code of Add-In that solved the problem:
ThisWorkbook
Option Explicit
Private Sub Workbook_Open()
' Purpose : Code run at opening of workbook
'-------------------------------------------------------------------------
'Initialise the application
InitApp
modProcessWBOpen.TimesLooped = 0
Application.OnTime Now + TimeValue("00:00:03"), "CheckIfBookOpened"
End Sub
Module 1 named modInit
Option Explicit
'Create a module level object variable that will keep the instance of the
'event listener in memory (and hence alive)
Dim moAppEventHandler As cAppEvents
Sub InitApp()
'Create a new instance of cAppEvents class
Set moAppEventHandler = New cAppEvents
With moAppEventHandler
'Tell it to listen to Excel's events
Set .App = Application
End With
End Sub
Module 2 named modProcessWBOpen
Option Explicit
'Counter to keep track of how many workbooks are open
Dim mlBookCount As Long
'Counter to check how many times we've looped
Private mlTimesLooped As Long
' Purpose : When a new workbook is opened, this sub will be run.
' Called from: clsAppEvents.App_Workbook_Open and ThisWorkbook.Workbook_Open
'-------------------------------------------------------------------------
Sub ProcessNewBookOpened(oBk As Workbook)
If oBk Is Nothing Then Exit Sub
If oBk Is ThisWorkbook Then Exit Sub
If oBk.IsInplace Then Exit Sub
CountBooks
'This checks to make sure the name of the new book matches what I
'want to place the button on
If oBk.Name = "TT_GO_ExceptionReport.xlsm" Then
Dim CommandButton As Button
Set CommandButton = Workbooks("TT_GO_ExceptionReport.xlsm").Sheets(1).Buttons.Add(1200, 100, 200, 75)
With CommandButton
.OnAction = "Project_Count"
.Caption = "Press for Simplified Overview"
.Name = "Simplified Overview"
End With
End If
End Sub
Sub CountBooks()
mlBookCount = Workbooks.Count
End Sub
Function BookAdded() As Boolean
If mlBookCount <> Workbooks.Count Then
BookAdded = True
CountBooks
End If
End Function
' Purpose : Checks if a new workbook has been opened
' (repeatedly until activeworkbook is not nothing)
'-------------------------------------------------------------------------
Sub CheckIfBookOpened()
If BookAdded Then
If ActiveWorkbook Is Nothing Then
mlBookCount = 0
TimesLooped = TimesLooped + 1
'May be needed if Excel is opened from Internet explorer
Application.Visible = True
If TimesLooped < 20 Then
Application.OnTime Now + TimeValue("00:00:01"), "CheckIfBookOpened"
Else
TimesLooped = 0
End If
Else
ProcessNewBookOpened ActiveWorkbook
End If
End If
End Sub
Public Property Get TimesLooped() As Long
TimesLooped = mlTimesLooped
End Property
Public Property Let TimesLooped(ByVal lTimesLooped As Long)
mlTimesLooped = lTimesLooped
End Property
Class Module named cAppEvents
' Purpose : Handles Excel Application events
'-------------------------------------------------------------------------
Option Explicit
'This object variable will hold the object who's events we want to respond to
Public WithEvents App As Application
Private Sub App_WorkbookOpen(ByVal Wb As Workbook)
'Make sure newly opened book is valid
ProcessNewBookOpened Wb
End Sub
Private Sub Class_Terminate()
Set App = Nothing
End Sub

Answer 2

something like this?
Option Explicit
Sub Button()
Dim cButton As Button
Dim rng As Range
Dim i As Long
ActiveSheet.Buttons.Delete
For i = 2 To 3 Step 2
Set rng = ActiveSheet.Range(Cells(i, 2), Cells(i, 2))
Set cButton = ActiveSheet.Buttons.Add(rng.Left, rng.Top, rng.Width, rng.Height)
With cButton
.OnAction = "Test_Press"
.Caption = "Press for Test " & i
.Name = "Test" & i
End With
Next i
End Sub
See Example here