How to get TreeViewItem from HierarchicalDataTemplate item?

by 
TreeViewItem item = (TreeViewItem)(mainTreeList
    .ItemContainerGenerator
    .ContainerFromIndex(mainTreeList.Items.CurrentPosition));

DOES NOT WORK (for me) as mainTreeList.Items.CurrentPosition in a treeview using a HierarchicalDataTemplate will always be -1.

NEITHER DOES below as as mainTreeList.Items.CurrentItem in a treeview using a HierarchicalDataTemplate will always be null.

TreeViewItem item = (TreeViewItem)mainTreeList
    .ItemContainerGenerator
    .ContainerFromItem(mainTreeList.Items.CurrentItem);

INSTEAD I had to set a the last selected TreeViewItem in the routed TreeViewItem.Selected event which bubbles up to the tree view (the TreeViewItem’s themselves do not exist at design time as we are using a HierarchicalDataTemplate).

The event can be captured in XAML as so:

<TreeView TreeViewItem.Selected="TreeViewItemSelected" .../>

Then the last TreeViewItem selected can be set in the event as so:

    private void TreeViewItemSelected(object sender, RoutedEventArgs e)
    {
        TreeViewItem tvi = e.OriginalSource as TreeViewItem;

        // set the last tree view item selected variable which may be used elsewhere as there is no other way I have found to obtain the TreeViewItem container (may be null)
        this.lastSelectedTreeViewItem = tvi;

        ...
     }

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