how to restrict the length of string or maximum number of characters in CommandBarControl in PowerPoint in VBA?

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VBA

PowerPoint

hi everyone !

i am trying to implement something like follows:

.Maxlength = "16"

so that i can restrict the length of the string that the user will put inside the control named oTextSA below.
Here's my code

Dim oTextSA As CommandBarControl

Set oTextSA = oGrp.Controls.Add(msoControlEdit)
        With oTextSA
        oTextSA.Visible = True
           oTextSA.Caption = "MyTextBox"
           .OnAction = "ExportTextToCSV"
End With