How to Position Thumb on Slider Component

Hi all:
I am relearning ActionScript after 6 years away, so please
excuse what may be a really stupid question. I am trying to use the
built-in Slider Component to resize a graphic in my movie. I've
used the Code example from the Flash online documentation and got
it to work. Trouble is, the thumb on the slider is starting at 10
percent when the movie loads, and I want it to start in the middle
(50%).
I tried setting the aSlider.value = 50; And that works,
except as soon as I finish dragging the slider, the thumb snaps
back to 50. I tried resetting it within the ChangeHandler function
to the new event.value, but that doesn't work. I tried assigning it
to a variable called thumbpos and setting that, also doesn't work.
How can I make the new event.value persist outside of the
function? See attached code. Thanks!!!
**************************************************

1. To set focus to a component, we call the Item.Specific.Click method on the component
2. I think that the order that fields are added to the form determines the tab index. I'm not aware of any property that would change this
3. Handle the ItemEvent event and check pVal.EventType to see if its type is et_VALIDATE. This means that the field specified by pVal.ItemUID is about to lose focus. If you set BubbleEvent to False, you can cancel the action and force the user to enter a new value without leaving the field.

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How to Position Thumb on Slider Component

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