How to include extension number with contact in Go Contact?

[gearhead]

I am using Go Contact and Go Dialer on my HTC Evo 4g and am very happy with the products. The only item I can't seem to figure out is how to add an extension number to a contact's phone number. In Google Contacts I can separate the extension number from the main phone number using commas. Go Contact doesn't seem to recognize the commas and instead adds the extension number directly to the end of the phone number. For example, my Google Contact shows a number of (123) 456-7890 ,,100. This becomes (123) 456-7890 100 in Go Contacts, which gets dialed as 1234567890100. This then gives an invalid number error when I try to call that contact. What is the best way to associate an extension number with a contact in Go Contact?