In teamsite we can get multiple options by using Select instance multiple="t". But it's a bit stupid that when i click one option(not press ctrl) then the other selected options highlight disappear......
Have you ever done any sort of web development? If yes, then you'll notice that TS uses a standard *multi-select* box. This is how HTML multi-select boxes behave and is a very STANDARD behavior out there. I'd like to think that most of the savvy users are aware of the CTRL + click rule.If you don't like this behavior, then one of the options could be to have a callout with your own implementation of "multi-select" box(es).