I've taken 4 instances of a common library button and want each to (1) on roll over, to display brief text describing what the user will encounter if clicked, and (2) to launch a movie when clicked. They only respond to the last command assigned. I'm dbl-clicking the instance, which, to my mind, is changing the symbol. When I just select a button (no dbl-clicking) and open the Actions panel, the On-Mouse Event is grayed. No locks are on. Also, when I choose a common library button, is a command from the Actions panel the only way I can assign actions to the diferent states of the button (vs. assigning in a frame (e.g., rollover) in the Timeline)?