Scrollbar is very popular in Flash.Exactly this tutorial explains, how to create a simple scrollbar using action the script.You will also learn how to create dynamic text field and more.
Step 1
Create a new Flash Documet, take the Text Tool (T), open the Properties Panel (Ctrl+F3) and set the Dynamic Text.
Step 2
Using drag and drop technique, create a "rectangle" in whic you'll add some text. Look at the picture! 
Step 3
Select the drawn "rectangle" open the Properties Panel (Ctrl+F3) and set the options from the picture below!
Step 4
Right click on the created "rectangle" and choose Scrollable.
Step 5
Copy a large text from somewhere and paste it in the created "rectangle" (area for text) or type any text in that "rectangle".
Step 6
Create two buttons in Flash, which will use for text scrolling. 
Step 7
Select the "UP" button, open the Action Script Panel (F9) and paste this script:
on (release) {
scrollbar.scroll -= 1;
}
Step 8
Then select the "DOWN" button, open again the Action Script Panel (F9) and paste this script:
on (release) {
scrollbar.scroll += 1;
}
Test your Movie (Ctrl+Enter).
We're done!
Download source file (.fla)
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