ActionScript 2.0 :: Self Updating List - Creating Correct Animation Effect?

How to construct the following in Flash 8 as 2. I have several items that need to be shown in a text field list, the list needs to update as a new item is to be displayed also the new item has to move up or down depending on how many items are on the list. For example the list has 6 items available,the fist three are a higher priority than the last three.

oranges
apples
mangoes
trucks
cars
boats

When items are called for example oranges we will have oranges in the text field
If the second item is called say trucks this will go below oranges,
If no oranges are called this will go in the top text field.
if we remove an item the remaining field will move up so there are no gaps in the text field.
For example start out with oranges only
oranges (top of list)

Next case add trucks
Oranges(top of list)
trucks
Next trucks only (remove oranges)
trucks( at top of list)

Next add and apples and oranges
Oranges ( top of List)
apples
trucks

Next add boats
Oranges ( top of List)
apples
trucks
boats

Next remove trucks
[Oranges ( top of List)
apples
boats

The actual movie clip is an aircraft caution and warning display that updates when faults occur. I know I can use an array to to populate the text field but I am not sure what to use to create the correct animation effect.