VB 2010 - Create Custom Configuration Section Using ConfigurationSection

Hi,

I am trying to create custom section in app.connfig file of my Windows Form application following instructions on this page:

http://msdn.microsoft.com/en-us/library/2tw134k3.aspx

but don't know how to do it.

I would like to have this in final:

<configuration>
   <startup>
      <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0,Profile=Client" />
   </startup>
   <productIdGroup>
      <ProductID="AAAAA-BBBBB"/>
   </productIdGroup>
</configuration>

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Until now I have this code:

Imports System.Configuration

Namespace TestSection
    Class CustomConfigSection
        Inherits ConfigurationSection

        ' Create a "productId" element.
        <ConfigurationProperty("productId")> _
        Public Property ProductID() As String
            Get
                Return Me("productId")
            End Get
            Set(ByVal value As String)
                Me("productId") = value
            End Set
        End Property
    End Class
End Namespace

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How can I store a value to key "ProductID" and save to app.config file?

I know, there are other possibilities how to store user settings, but I would like to store it in my custom section.

Thanks.