Flash Tip: Making an Invisible "Hotspot" Button

Now, to make the button transparent, you're going to adjust the alpha. Select both the line and the fill, and on the color Mixer panel to the right, flick first the stroke/line button, and then drag the Alpha slider all the way down to 0%. When that's done click the fill button, and drag the Alpha on your color all the way down to 0%. (If you use a gradient you have to click on each of the color markers and adjust the alpha for all of them.) By the time you're done your button should be completely black to denote the transparency.