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    <p>Every time you generate a car in your <code>animateCars()</code> function, you could iterate through all the children and put the buildings above the cars, but that's a little tedious and unnecessary (and not very efficient).</p> <p>This would be a much better method:</p> <pre><code>//create a container for the cars var carContainer:Sprite = new Sprite(); addChild(carContainer); //create a container for the buildings var buildingContainer:Sprite = new Sprite(); addChild(buildingContainer); </code></pre> <p>Since you added <code>buildingContainer</code> after <code>carContainer</code>, it will always be on top (including everything you put in it)</p> <p>So now your <code>animateCars</code> method:</p> <pre><code>public function animateCars() { CarMC = Random_Car(); carContainer.addChild(CarMC); if (CarLeft) { CarMC.x = 0; CarMC.y = 245; MoveCar = new Tween(CarMC,"x",None.easeNone,-60,900,12,true); } else { CarMC.x = 0; CarMC.y = 258; CarMC.scaleX *= -1; MoveCar = new Tween(CarMC,"x",None.easeNone,800,-260,12,true); } MoveCar.addEventListener(TweenEvent.MOTION_FINISH, CarFinished); MoveCar.start(); } </code></pre> <p>Then your <code>carFinished</code> method:</p> <pre><code>function CarFinished(e:TweenEvent):void { carContainer.removeChild((e.currentTarget as Tween).obj as Random_Car); } </code></pre> <p>Then in your <code>addBuilding</code> method, change <code>addChildAt(Building,numChildren);</code> to:</p> <pre><code>buildingContainer.addChild(Building); </code></pre>
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    1. COThis works great thanks for explain all this. only one issue is a get an error when removing the tweens. `TypeError: Error #2007: Parameter child must be non-null.` I have tried `carContainer.removeChild(getChildByName("CarNumber_"+CarNumberR));` but no fix, do you think you know why there is this issue?
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    2. COLook at the CarFinished method I added above and try that. No need for the CarNumber variable, plus it may be a typo in your comment, but you have `CarNumberR` - note the R at the end - this isn't what your using when you name the car
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    3. CO@LondonDrugs_MediaServices A great explanation.
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