I`m noob to C2,and I met "picking" problems several times.
Here is my case, I wanted to pick 4 instance at one time and make them visible.
Here is how I did it by picking IID
<img src="https://dl.dropbox.com/u/133630680/question.png" border="0" />
apparently, it doesn`t work the way that I want, how can achieve it?