Wondering how to use ContextMenu (BrowseMenu) when we right click an item in the following treepanel?

<ext:Menu ID="BrowseMenu" runat="server">
            <Items>
                <ext:MenuItem Text="Create New" >
                    <Listeners>
                        <Click Handler="Ext.Msg.alert(this.parentMenu.node.text, 'Create sub items');" />
                    </Listeners>
                </ext:MenuItem>
            </Items>
            <Listeners>
                <BeforeShow Handler="#{NodeLabel}.el.update(this.node.text);" />
            </Listeners>
        </ext:Menu>
<ext:Viewport runat="server" Layout="BorderLayout">
            <Items>
                <ext:Panel runat="server" Region="North" Split="true" Height="50" BodyPadding="6" BodyStyle="background-color:grey;" />
                <ext:Panel runat="server" Title="West" Region="West" Layout="FitLayout" Width="300" MinWidth="250" MaxWidth="400" Split="true" Collapsible="true">
                    <Items>
                        <ext:TreePanel ID="TreePanel1" runat="server" Height="400" Width="250" NoLeafIcon="true" UseArrows="true" AutoScroll="true" 
                            Animate="false" HideHeaders="true" RootVisible="false" ContextMenuID="BrowseMenu">
                            <Root>
                                <ext:Node>
                                    <Children>
                                        <ext:Node Text="Karlstation" Expanded="true">
                                            <Children>
                                                <ext:Node Text="Airport">
                                                    <Children>
                                                        <ext:Node Text="Fakturor" Leaf="true" Checked="false" />
                                                        <ext:Node Text="Dokument" Leaf="true" Checked="false" />
                                                    </Children>
                                                </ext:Node>
                                                <ext:Node Text="Houses" />
                                            </Children>
                                        </ext:Node>
                                    </Children>
                                </ext:Node>
                            </Root>
                        </ext:TreePanel>
                    </Items>
                </ext:Panel>
                <ext:TabPanel runat="server" Region="Center">
                    <Items>
                        <ext:Panel runat="server" Title="Center" Border="false" BodyPadding="6" />
                        <ext:Panel runat="server" Title="Close Me" Closable="true" Border="false" BodyPadding="6" Html="Closeable Tab" />
                    </Items>
                </ext:TabPanel>
                <ext:Panel runat="server" Title="East" Region="East" Collapsible="true" Split="true" MinWidth="250" Width="700" Layout="Fit">
                    <Items>
                        <ext:TabPanel runat="server" ActiveTabIndex="1" TabPosition="Bottom" Border="false">
                            <Items>
                                <ext:Panel runat="server" Title="Tab 1" Border="false" BodyPadding="6" Html="East Tab 1" />
                                <ext:Panel runat="server" Title="Tab 2" Closable="true" Border="false" BodyPadding="6" Html="East Tab 2" />
                            </Items>
                        </ext:TabPanel>
                    </Items>
                </ext:Panel>
            </Items>
        </ext:Viewport>