You do realize that Netscalar and Go To Meeting are two totally different, unrelated products? There are from the same company, true, but that doesn't mean that the one is an SDK for the other...
Netscaler[
^]
Go To Meeting[
^]
I don't think you will find an SDK that lets you "develop a Go to meeting (Desktop Sharing)project" - you will have to do what the rest of us do: Design it, and start coding.