That is just how they work.
Portals used to do the same thing but FileMaker Inc. 'fixed' that problem. Many people must have submitted a feature request for that so I suggest you do the same for your issue. ;)
The response from uLearnIT is correct. To enter a feature request, go to:
I could easily copy and paste this suggestion for you, but there are questions asked that only you can answer.
When entering the feature request, please explain why this is needed. I have noticed that more attention is given to those requests that provide real-life examples.