Using a custom easing function
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
backgroundColor="white">
<mx:Script>
public function myEasing(t:Number, b:Number, c:Number,d:Number):Number {
t/=d;
return b+c*(t);
}
</mx:Script>
<mx:Move id="myEffect" xBy="300" easingFunction="{myEasing}" />
<mx:Button label="Make me move" mouseDownEffect="{myEffect}" />
</mx:Application>
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