If you want something simple like on click button go to layout 2 then just add the object button and do button is click condition then the action go to layout 2. its the easiest thing to do.
There also the on mouse object clicked onto sprite that turn a sprite object into a button like object. and just add the action.
Or you can put in the nuke launch code into a text field and then sprite hover over the sprite using mouse over the button.