brianraymes opened a new issue #848:
URL: https://github.com/apache/royale-asjs/issues/848
An item cannot be added to an ArrayList bound to a DataContainer.
**Steps to Reproduce**
1. _Create a bindable ArrayList_
```
[Bindable]
public var names:ArrayList = new ArrayList(["A", "B", "C"]);
```
2. _Create a DataContainer (non-highlightable and non-selectable list of
itemRenderers)_
```
<j:DataContainer dataProvider="{names}">
<j:beads>
<js:CollectionChangeUpdateForArrayListData/> <!-- Uncertain if
necessary -->
</j:beads>
</j:DataContainer>
```
3. _Attempt to add an item_
```
names.addItem("D");
```
**Expected Results**
Item is added and displays in the DataContainer.
**Actual Results**
The following error is produced:
```
TypeError: Error #1034: Type Coercion failed: cannot convert
org.apache.royale.jewel.beads.models.DataProviderModel to
org.apache.royale.core.ISelectionModel
at Function.org.apache.royale.utils.Language.as
(c:\dev\uc\apps\web\royale\target\javascript\bin\js-debug\org\apache\royale\utils\Language.js:115:12)
at
org.apache.royale.html.beads.DataItemRendererFactoryForCollectionView.itemAddedHandler
(c:\dev\uc\apps\web\royale\target\javascript\bin\js-debug\org\apache\royale\html\beads\DataItemRendererFactoryForCollectionView.js:89:56)
at
org.apache.royale.collections.ArrayList.org.apache.royale.events.EventDispatcher.fireListeners
(c:\dev\uc\apps\web\royale\target\javascript\bin\js-debug\org\apache\royale\events\EventDispatcher.js:100:24)
at Function.goog.events.EventTarget.dispatchEventInternal_
(c:\dev\uc\apps\web\royale\target\javascript\bin\js-debug\library\closure\goog\events\eventtarget.js:381:27)
at
org.apache.royale.collections.ArrayList.org.apache.royale.events.EventDispatcher.dispatchEvent
(c:\dev\uc\apps\web\royale\target\javascript\bin\js-debug\org\apache\royale\events\EventDispatcher.js:74:38)
at org.apache.royale.collections.ArrayList.addItemAt
(c:\dev\uc\apps\web\royale\target\javascript\bin\js-debug\org\apache\royale\collections\ArrayList.js:160:9)
at org.apache.royale.collections.ArrayList.addItem
(c:\dev\uc\apps\web\royale\target\javascript\bin\js-debug\org\apache\royale\collections\ArrayList.js:126:9)
. . .
```
**Observations**
It appears that each _item<Added|Updated|Removed>Handler_ method within
DataItemRendererFactoryForCollectionView assumes that the data model belongs to
a list that contains a selectable index. The DataContainer is not selectable,
therefore does not contain a selectable index.
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