OptionButton not included in a GroupBox

[Flexx]

Hello

I have a problem with my OptionButtons and my GroupBoxes.

In a form, which is a kind of survey, GroupBoxes and OptionButtons are automatically generated, depending on the number of questions.

Each OptionButton must fit in a cell, and a GroupBox has to include many OptionButtons.

But there is a problem. Some OptionButtons are not included in the GroupBox

So, it is possible to select more than one option button into the group !

You can see it on the following capture :

Or this one :

You can play with the attached file to see the problem.

Or use the following code :

Sub Bouton1_Clic()

Dim myCell As Range
Dim numCell As Integer
Dim myGroupBox As GroupBox
Dim myOptionButton As OptionButton
    
ActiveSheet.OptionButtons.Delete
ActiveSheet.GroupBoxes.Delete

numCell = 0
For Each myCell In ActiveSheet.Range("E2:E12").Cells
    If numCell = 0 Then
        Set myGroupBox = ActiveSheet.GroupBoxes.Add(myCell.Left, myCell.Top, myCell.Width, (myCell.Height * 3))
        myGroupBox.Caption = ""
    End If
    numCell = numCell + 1
    If numCell = 3 Then numCell = 0
Next

numCell = 0
For Each myCell In ActiveSheet.Range("E2:E13").Cells
    Set myOptionButton = ActiveSheet.OptionButtons.Add(myCell.Left, myCell.Top, 5, 5)
    myOptionButton.Caption = ""
Next

End Sub

Thanks a lot for your help.