Wow! Great answer. It works for me too. I do not actually want the tool tips. The link was not working by itself and I added the tooltip to help find where the fault was.
There is an interesting issue if you hit the back button after going to the definition as you see the tooltip still open. It stays there for a few seconds before it disappears.
Many thanks for your help. Your fix has worked for me. I agree Tom should look so I will leave the issue as unresolved at the moment.