I have a template with two sheets (MASTER.. codename Sheet1, and
Summary.....codename Sheet3). There are no general modules, and the
ThisWorkbook module is empty. The only code is in Sheet1.

On the Master sheet is a CommandButton from the Controls toolbox, which
allows a new sheet to be added and formatted according to ranges in the
Master. It also creates 3 new buttons (from the Forms toolbar) on the new
sheet, and assigns separate subs in the Master sheet code module to each
button......and it's the assign statement that is failing.

Here is the relevent Sheet1 code:

Private Sub Cb_NewSheet_Click()
Dim strSheetName As String, strNoOfPages As Integer
Dim i As Integer, pasteRng As Range, ws As Worksheet
Application.ScreenUpdating = False
strSheetName = Application.InputBox _
("Please enter a name for the new sheet", Type:=2)
If strSheetName = "" Then
MsgBox ("You must enter a name for the sheet")
Exit Sub
End If
strNoOfPages = Application.InputBox _
("How many pages do you need?", Type:=1)
If strNoOfPages = False Then
MsgBox ("You must specify how many pages")
Exit Sub
End If
Worksheets.Add Befo=Sheets("Summary")
ActiveSheet.Name = strSheetName

' code then follows to format the new sheet, create the
' required number of pages, and then call the button sub:

Call Create3Buttons
'which leads to:

Private Sub Create3Buttons()
Dim btn As Button, ws As Worksheet

Set ws = ActiveSheet
With ws
Set btn = ws.Buttons.Add(550, 60, 100, 15)
btn.Select
Selection.Characters.Text = "Add a Page"
With Selection
.Font.Name = "Arial"
.Font.FontStyle = "Regular"
.Font.Size = 10
.Font.ColorIndex = xlAutomatic
.Locked = True
.LockedText = True
End With
btn.OnAction = ThisWorkbook.Name & _
"!Sheet1.General_Button1_click"

Set btn = ws.Buttons.Add(550, 80, 100, 15)
btn.Select
Selection.Characters.Text = "Show Page Heights"
With Selection
.Font.Name = "Arial"
.Font.FontStyle = "Regular"
.Font.Size = 10
.Font.ColorIndex = xlAutomatic
.Locked = True
.LockedText = True
End With
btn.OnAction = ThisWorkbook.Name & _
"!Sheet1.General_Button2_click"

Set btn = ws.Buttons.Add(550, 100, 100, 15)
btn.Select
Selection.Characters.Text = "Hide Page Heights"
With Selection
.Font.Name = "Arial"
.Font.FontStyle = "Regular"
.Font.Size = 10
.Font.ColorIndex = xlAutomatic
.Locked = True
.LockedText = True
End With
btn.OnAction = ThisWorkbook.Name & _
"!Sheet1.General_Button3_click"

.Range("A1").Select

End With
End Sub

The btn.OnAction statement fails with the message
"Unable to set the OnAction property of the Button class".

The same statement has worked in other books. Why might it now have stopped,
please?

Regards.



' and the the button code: