Tree component in Flex 4

Question

Are there any known issues with the <mx:Tree component in Flex 4?
We have upgraded from Flex 3 builder to Flex 4 builder. Everything works except any where we have used a tree component the data is no longer showing. Has there been a change in how to populate the Tree component? We populate the tree by setting the dataProvider with an ArrayCollection.

Answer 1

@travr,
I'm not aware of any big known issues in mx:Tree between Flex 3.x and Flex 4.x. What problems are you seeing, and can you reproduce the issue with a simple test case (if so, please post the simple test case here and we can take a look).
This works in Flex 3.5:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:ApplicationControlBar dock="true">
        <mx:Button id="sdkVer" initialize="sdkVer.label = mx_internal::VERSION;" click="System.setClipboard(sdkVer.label);" />
    </mx:ApplicationControlBar>
    <mx:Tree id="tr" labelField="name" width="200" x="20" y="20">
        <mx:dataProvider>
            <mx:ArrayCollection>
                <mx:Object name="1. One">
                    <mx:children>
                        <mx:Object name="1.1 One" />
                        <mx:Object name="1.2 Two" />
                    </mx:children>
                </mx:Object>
                <mx:Object name="2. Two">
                    <mx:children>
                        <mx:Object name="2.1 One" />
                    </mx:children>
                </mx:Object>
            </mx:ArrayCollection>
        </mx:dataProvider>
    </mx:Tree>
</mx:Application>
And this seems to work in Flex 4.5/Hero beta:
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
               xmlns:s="library://ns.adobe.com/flex/spark"
               xmlns:mx="library://ns.adobe.com/flex/mx">
    <s:controlBarContent>
        <s:Button id="sdkVer" initialize="sdkVer.label = mx_internal::VERSION;" click="System.setClipboard(sdkVer.label);" />
    </s:controlBarContent>
    <mx:Tree id="tr" labelField="name" width="200" x="20" y="20">
        <mx:dataProvider>
            <s:ArrayCollection>
                <fx:Object name="1. One">
                    <fx:children>
                        <fx:Object name="1.1 One" />
                        <fx:Object name="1.2 Two" />
                    </fx:children>
                </fx:Object>
                <fx:Object name="2. Two">
                    <fx:children>
                        <fx:Object name="2.1 One" />
                    </fx:children>
                </fx:Object>
            </s:ArrayCollection>
        </mx:dataProvider>
    </mx:Tree>
</s:Application>
Peter