Combobox in Menu Bar Event code

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L.S.

I Wrote this code:

Sub AddMenuItem()

Dim oMainMenuBar As Object
Dim objCommandBarComboBox As Office.CommandBarComboBox

Set oMainMenuBar = CommandBars.Item("Menu Bar")
Set objCommandBarComboBox =
oMainMenuBar.Controls.Add(msoControlEdit)

End Sub

Now I need some code that runs when the user changes the text in the
combobox and the length = 6 characters.

Can someone help me

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