Tree uses an XMLListCollection object as the data source:

      
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<!-- dpcontrols\UseXMLDP.mxml -->
<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"
    width="650">
    <s:layout>
        <s:VerticalLayout />
    </s:layout>
    <fx:Declarations>
        <fx:XML id="capitals">
            <root>
                <Capitals label="U.S. State Capitals">
                    <capital label="AL" value="Montgomery" />
                    <capital label="AK" value="Juneau" />
                    <capital label="AR" value="Little Rock" />
                    <capital label="AZ" value="Phoenix" />
                </Capitals>
                <Capitals label="Canadian Province Capitals">
                    <capital label="AB" value="Edmonton" />
                    <capital label="BC" value="Victoria" />
                    <capital label="MB" value="Winnipeg" />
                    <capital label="NB" value="Fredericton" />
                </Capitals>
            </root>
        </fx:XML>
        <!--
            Create an XMLListCollection representing the Tree nodes.
            capitals.Capitals is an XMLList with both Capitals elements.
        -->
        <mx:XMLListCollection id="capitalColl" source="{capitals.Capitals}" />
    </fx:Declarations>
    <s:Label
        text="These two Tree controls appear identical, although their data sources are different." />
    <s:HGroup>
        <!--
            When you use an XML-based data provider with a tree you must specify
            the label field, even if it is "label". The XML object includes the
            root, so you must set showRoot="false". Remember that the Tree will
            not, by default, reflect dynamic changes to the XML object.
        -->
        <mx:Tree id="Tree1" dataProvider="{capitals}" labelField="@label"
            showRoot="false" width="300" />
        <!-- The XMLListCollection does not include the XML root. -->
        <mx:Tree id="Tree2" dataProvider="{capitalColl}" labelField="@label"
            width="300" />
    </s:HGroup>
</s:Application>

1.	XML data for Tree view
2.	Reference XML attribute for tree data
3.	Set dataProvider for Tree control through xml attribute
4.	Using XML data models and use it as data for Tree control
5.	Tree data is from XMLListCollection
6.	Use ActionScript to set up the data provider for Tree control
7.	Fill XML data into Tree and get it back when selected
8.	AdvancedDataGrid with Grouping(A tree table).
9.	Tree with static data
10.	Hierarchical AdvancedDataGrid Tree Column(TreeTable)
11.	Use an XML object and Tree control
12.	Tree control and XMLListCollection
13.	Build Tree from XMLListCollection
14.	Search Tree node is to search XML with XPath
15.	Build a tree out of an XML document
16.	Tree controls uses an XML object directly
17.	Create Tree object from XMLList
18.	Tree with static value

Tree uses an XMLListCollection object as the data source: : Tree Data « Components « Flex

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