changing Icon of a TreeNode

[_xpto]

My code is:

<ext:Panel ID="pnlMain" runat="server" Width="200" Layout="Accordion" Split="true" Region="West" Margins="5 5 5 5" DefaultBorder="false">
    <Items>
        <ext:TreePanel ID="TreePanel1" IDMode="Explicit" runat="server" Animate="true" RootVisible="false"
             Title="Item 1" AutoScroll="true" StyleSpec="margin-top: 0px;" Icon="ApplicationViewList" AnimCollapse="true">
            <Root>
                <ext:TreeNode NodeID="root1" Expanded="true" Expandable="False">
                    <Nodes>
                        <ext:TreeNode NodeID="n1_1" Text="Item 1.1" AllowDrag="false" Icon="Accept"></ext:TreeNode>
                    </Nodes>
                </ext:TreeNode>
            </Root>
        </ext:TreePanel>
    </Items>
</ext:Panel>

if I do:

TreePanel1.Icon = Icon.Add;

it works but I don't know how to find the NodeID "n1_1" to change its icon.

[_xpto]

solved without answers.