hi,

You can try this code:

<ig:XamDataTree MouseRightButtonDown="XTree_MouseRightButtonDown"
                ItemsSource="{Binding Data}">
    <ig:ContextMenuService.Manager>
        <ig:ContextMenuManager>
            <ig:ContextMenuManager.ContextMenu>
                <ig:XamContextMenu Opening="XamContextMenu_Opening"
                                   Opened="XamContextMenu_Opened">
                    <ig:XamMenuItem Header="Item 1" />
                    <ig:XamMenuItem Header="Item 2" />
                </ig:XamContextMenu>
            </ig:ContextMenuManager.ContextMenu>
        </ig:ContextMenuManager>
    </ig:ContextMenuService.Manager>
</ig:XamDataTree>

private XamDataTreeNodeControl clickedNode;

private void XamContextMenu_Opening(object sender, OpeningEventArgs e)
{
    var node = e.GetClickedElements<XamDataTreeNodeControl>().FirstOrDefault();

    if (node != null
        && node.Node != null
        && node.Node.NodeLayout != null
        && node.Node.NodeLayout.Tree != null)
    {
        clickedNode = node;

        var selectedNodes = clickedNode.Node.NodeLayout.Tree.SelectionSettings.SelectedNodes;
        selectedNodes.Clear();
        selectedNodes.Add(clickedNode.Node);

        return;
    }

    clickedNode = null;
    e.Cancel = true;
}

private void XamContextMenu_Opened(object sender, OpenedEventArgs e)
{
    // TODO
}

private void XTree_MouseRightButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
    XamDataTree dataTree = sender as XamDataTree;
    UIElement rootVis = Application.Current.RootVisual;

    if (dataTree != null && rootVis != null)
    {
        var nodeControl =
            VisualTreeHelper.FindElementsInHostCoordinates(e.GetPosition(rootVis), dataTree)
                            .OfType<XamDataTreeNodeControl>()
                            .FirstOrDefault();

        if (nodeControl != null && nodeControl.Node != null)
        {
            nodeControl.Node.IsActive = true;
        }
    }
}

Hope this helps