使用selenium在webapp上查找可见元素

I need help to find visible elements on a webapp page using selenium. For example, I need to find a row that is click-able and click on it. The problem is that the elements are visible but not present in the page source as they are generated. Also, I'm coding in Java to find the elements. I tried using xpath and css path which I found using Firefox Firebug, but it didn't work. The click-able rows in the table all have the same class. They have different text though. Any help? Thanks!I need help to find visible elements on a webap