I work more with Adobe Flash Pro and the solution there would be to create two functions, or perhaps one function that does two things. If you name the function myFunc() then have the event listener in Live Cycle for the button call that single function that does two things. Or have it call each individual function separately as a third function which is called when the button is pressed. You would, in that case be calling the two functions from within the third function.
I will have to investigate LC documentation further to help you more, if possible. Does LC use JavaScript or some other language?