Saving combobox items to registry

I'm using the following code to write single textboxes to the registry, how can i write combobox items to the registry???  So if i have a combobox named combobox1, how would i save each entry to the registry?

Dim key As RegistryKey = Registry.CurrentUser.OpenSubKey("Software", True)
        ' Add one more sub key 
        Dim newkey As RegistryKey = key.CreateSubKey("Service Desk Tools\\SCCM Reports")
        ' Set value of sub key 
        newkey.SetValue("Workstation Advertisement Lookup", tbAC.Text)
        newkey.SetValue("Workstation Collection", tbWC.Text)

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