Hello Henry,

 I am just checking your progress on the issue. If you require any further assistance please do not hesitate to ask.

Thank you again lvo. I tried manually search for the node and it works but the follwoing using Search doesn't work... Can you see anything wrong with the search? 

public void SetSelectedNode(string nodeId)
{
    _selectedNodeId = new Guid(nodeId);
    var searchResult = XamOrgChart.Search(CompareNodeId).SingleOrDefault();
    if (searchResult != null)
    {
        XamOrgChart.SelectedNodes.Clear();
        XamOrgChart.SelectedNodes.Add(searchResult);
    }
}

private bool CompareNodeId(object data)
{
    var node = data as OrgChartNode;
    if (node != null)
    {
         return node.Id == _selectedNodeId;
    }
    return false;
}

Thanks for the reply Ivo. I just tried what you said. We use customized node object and bind a list of our node objects to the ItemsSource property. The chart displays ok. However, when I tried to set the selected node, the line OrgChart.SelectedNodes.Add(node); has compile error "Argument type "MyNode" is not assignable to parameter type  Infragistics.Controls.Maps.OrgChartNode...

Does that mean I need to go through all nodes in the chart and find the one I want and then add it to the SelectedNodes collection? I presume OrgChartNode.Data contains my node. Is that right? 

Thanks,

Henry