ActionScript 3.0 :: Variables Not Changing To New Location Coordinates

I have a simple Actionscript 3 project. The code is on the timeline:
ActionScript Code:
import pti.dmutility.layout.ConfigElement;
//this Class simply extends the fl.controls.Button with variables

Then I put some instances into the stage, and make them Drag&Drop. Here is the Dragging function. I want to remember the item's puck up position when clicked, I use ConfigElement's OldX and OldY properties:
ActionScript Code:
function dragStarterItem(e:MouseEvent):void{
var item = e.target;
item.OldX = item.x;
item.OldY = item.y;
item.startDrag();
item.addEventListener(MouseEvent.MOUSE_UP, dragStopperItem);
}

When I click on the item, the OldX and OldY gets the actual position of the item, BUT after dropping it somewhere else, and picking up it again, the OldX and OldY is still the same! Holds the initial position, and not changing to it's new location coordinates. Every instance remembers it's initial position only. Why not change every time I click? Why remembering the first click's position only?