Macromedia flash 8-developing flash lite 2.x applications User Manual

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Creating scrolling text (Flash Professional Only)
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9.
Create a new button symbol, and add an instance of it to the Stage or in the area off 
the Stage.
This button acts as key catcher button, and it doesn’t need to be visible to the user. For 
more information about creating key catcher buttons, see 
10.
Select the button, and open the Actions panel (Window > Actions).
11.
Enter the following code in the Actions panel:
on(keyPress "<Down>") {
story.scroll++;
}
on(keyPress "<Up>") {
story.scroll--;
}
12.
Select Control > Test Movie to test the application in the Flash Lite emulator.
Press the Up and Down Arrow keys on your keyboard (or the Up and Down buttons on 
the emulator’s keypad) to scroll the text up or down.
For simplicity, this example lets you enter the text field’s content in the authoring tool. But 
you can easily modify the example so that the text field’s content is updated using 
ActionScript. To do this, you would write ActionScript that assigns the desired text to the 
variable name that you assigned to the multiline text field (
story
, in this example). 
story = "Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Sed 
ipsum. Nam tempus. Nullam sed velit eget sem consectetuer tempor. Morbi 
eleifend venenatis pede. Cras ac lorem eget massa tincidunt 
iaculis...etc."