Question

Given a random TreeViewItem from a tree, how do I retrieve the granddaddy, er root of the node?

I am using this to highlight the root upon clicking a child item.

private void TreeViewDecode_PreviewMouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
     TreeViewItem treeViewItem = GetSexyGrandDaddy(e.OriginalSource as DependencyObject);
     ...
}
private static TreeViewItem GetSexyGrandDaddy(DependencyObject source)
{
        if (source != null && source is TreeViewItem)
        {
            TreeViewItem root = VisualTreeHelper.GetParent(source) as TreeViewItem;

            while (root.Parent != null)
            {
                root = root.Parent as TreeViewItem;
            }
            return root as TreeViewItem;
        }
        return null;
}

Edit: Code updated still doesn’t work

Answer 1

with root you mean the ‘Parent’ i guess,

look at TreeViewItem.Parent

UPDATE
look at this code:

use

    e.Source 

instead of

    e.OrginalSource

---

    private void treeView1_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        TreeViewItem treeViewItem = GetSexyGrandDaddy(e.Source as DependencyObject);
        if (treeViewItem != null)
        {
            //do highlight...
        }
    }

    private static TreeViewItem GetSexyGrandDaddy(DependencyObject source)
    {
        TreeViewItem sugarDad = source as TreeViewItem;
        if (sugarDad != null)
        {
            while (sugarDad.Parent as TreeViewItem != null)
                sugarDad = sugarDad.Parent as TreeViewItem;
        }
        return sugarDad;
    }