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Steps to reproduce:
1. Create a tilelist using the following code

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:initialize>
<![CDATA[
for (var counter:int = 0; counter < 2000; counter ++) {
objArrayCollection.addItem(new Label());
}
]]>
</mx:initialize>
<mx:TileList x="0" y="0" width="640" height="480" rowHeight="100" columnWidth="100" direction="horizontal" dataProvider="{objArrayCollection}" itemRenderer="mx.controls.Label">
</mx:TileList>
<mx:Script>
<![CDATA[
import mx.controls.Label;
import mx.collections.ArrayCollection;

[Bindable]
private var objArrayCollection:ArrayCollection = new ArrayCollection;
]]>
</mx:Script>
</mx:Application>

2. Scroll half-way down the tilelist and select a tile.
3. Scroll back up to the top of the tilelist.
4. Use the arrow keys to navigate down.
 
 Actual Results:
TypeError: Error #1010: A term is undefined and has no properties.
at mx.controls.listClasses::TileBase/finishKeySelection()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\controls\listClasses\TileBase.as:1650]
at mx.controls.listClasses::TileBase/moveSelectionVertically()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\controls\listClasses\TileBase.as:1365]
at mx.controls.listClasses::TileBase/keyDownHandler()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\controls\listClasses\TileBase.as:2484]
 
 Expected Results:
 The tilelist jumps to the selected tile.

 Workaround (if any):
None
 
 
 

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Steps to reproduce: 1. Create a tilelist using the following code <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"> <mx:initialize> <![CDATA[ for (var counter:int = 0; counter < 2000; counter ++) { objArrayCollection.addItem(new Label()); } ]]> </mx:initialize> <mx:TileList x="0" y="0" width="640" height="480" rowHeight="100" columnWidth="100" direction="horizontal" dataProvider="{objArrayCollection}" itemRenderer="mx.controls.Label"> </mx:TileList> <mx:Script> <![CDATA[ import mx.controls.Label; import mx.collections.ArrayCollection; [Bindable] private var objArrayCollection:ArrayCollection = new ArrayCollection; ]]> </mx:Script> </mx:Application> 2. Scroll half-way down the tilelist and select a tile. 3. Scroll back up to the top of the tilelist. 4. Use the arrow keys to navigate down.    Actual Results: TypeError: Error #1010: A term is undefined and has no properties. at mx.controls.listClasses::TileBase/finishKeySelection()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\controls\listClasses\TileBase.as:1650] at mx.controls.listClasses::TileBase/moveSelectionVertically()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\controls\listClasses\TileBase.as:1365] at mx.controls.listClasses::TileBase/keyDownHandler()[E:\dev\3.0.x\frameworks\projects\framework\src\mx\controls\listClasses\TileBase.as:2484]    Expected Results:  The tilelist jumps to the selected tile.  Workaround (if any): None