highlighting bottons and text in a rollout pannel

I have three buttons and three editboxes
I want to modify, or highlight the second editbox, at pressing the first button. (for example)

also I would like to introduce text in an editbox, and pressing enter, it letme go to another editbox to introduce another text, directly.

Is that possible? is possible to choose what element from rolloutpannel will be selected or highlighted, with codeline?