[AC-1009] ListView does not allow attributedString to be set on label

...
<ListView id="listView" defaultItemTemplate="result">
  <Templates>
    <ItemTemplate name="result">
      <View id="row">
        <Label  bindId="snippet" id="snippet" />
      </View>
    </ItemTemplate>
  </Templates>
  <ListSection id="section"></ListSection>
</ListView>
...

var snippet = "Test string";
var formatter = Titanium.UI.iOS.createAttributedString({
  text : snippet,
  attributes : [{
    type : Titanium.UI.iOS.ATTRIBUTE_BACKGROUND_COLOR,
    value : 'yellow',
    range : [0, 4]
  }]
});

var item = {
  snippet : {
    text : snippet,
    attributedString : formatter
  },
  properties : {
    height : Ti.UI.SIZE,
    accessoryType : 1,
    itemId : 0,
  },
};

$.section.appendItems([item]);

[WARN] :   Creating [object TiUIiOSAttributedString] in a different context than the calling function.