Add a checkbox to MultiPage by Code

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VBA

Microsoft tells me how I can add a checkbox to a MultiPage[^]

Dim MyTextBox As Control 
 
Private Sub CommandButton1_Click() 
Set MyTextBox = MultiPage1.Pages(0).Controls.Add("MSForms" _ 
 & ".TextBox.1", "MyTextBox", Visible) 
End Sub 

So I modified the code

Set myTextBox = MultiPage1.Pages(zaehler).Controls.Add("MSForms" & ".TextBox.1", "TextBox" & zaehler, Visible)

If I run the makro now, it shows me a runtime error: invalid class name
Where is my fault? I can't find it :(