How to automate file download window's "open with" option in internet explorer

Trying to automate the IE's window which appears when any file gets downloaded,
need to click on "Open with" option which is a part of SplitButton,

<img src='https://i.stack.imgur.com/XJMJp.png'/>

Unable to find the "Open with" option as Child/Descendant of the window, Although rest of the buttons could easily be found.

What I have tried:

Tried recursively find the window, but NO SUCCESS

FindTreeViewDescendants(elementNode)
{
 AutomationElement elementNode = TreeWalker.ControlViewWalker.GetFirstChild(targetTreeViewElement);

        while (elementNode != null)
        {
            // Test for the control patterns of interest for this sample.
            object objPattern;
            ExpandCollapsePattern expcolPattern;
            if (true == elementNode.TryGetCurrentPattern(ExpandCollapsePattern.Pattern, out objPattern))
            {
                expcolPattern = objPattern as ExpandCollapsePattern;
                if (expcolPattern.Current.ExpandCollapseState != ExpandCollapseState.LeafNode)
                {
                    ExpandCollapsePattern expandPattern = ((ExpandCollapsePattern)expcolPattern);
                    if (expandPattern.Current.ExpandCollapseState != ExpandCollapseState.Expanded)
                        expandPattern.Expand();
                }
            }
            TogglePattern togPattern;
            if (true == elementNode.TryGetCurrentPattern(TogglePattern.Pattern, out objPattern))
            {
                togPattern = objPattern as TogglePattern;
                TogglePattern expandPattern = ((TogglePattern)togPattern);
                if (expandPattern.Current.ToggleState != ToggleState.On)
                    expandPattern.Toggle();
            }
            InvokePattern invPattern;
            if (true == elementNode.TryGetCurrentPattern(InvokePattern.Pattern, out objPattern))
            {
                if (elementNode.Current.Name == "Open with")
                {
                    invPattern = objPattern as InvokePattern;
                    InvokePattern expandPattern = ((InvokePattern)invPattern);
                    expandPattern.Invoke();
                }
            }

            // Iterate to next element.
            // elementNode - Current element.
            // treeviewIndex - Index of parent TreeView.
            FindTreeViewDescendants(elementNode);
            elementNode = TreeWalker.ControlViewWalker.GetNextSibling(elementNode);

Tags: C#, Windows, Automation