After investigating Infragistic's code using Reflector I see that
when context menu is opened via keyboard, it is shown at the center of
the parent control and there is no way to override this behavior. So I've tried to do something similar to what
UltraToolbarsManager.SetContextmenuUltra does but simplified. It works similar to Windows Explorer.

I've
created a class inherited from UltaTree and added the following code:

private bool contextMenuShortcutPressed_;

public MyTree()
{
    KeyDown += (sender, e) =>
    {
        if (e.KeyCode == Keys.Apps || (e.KeyCode == Keys.F10 && e.Modifiers == Keys.Shift))
        {
            contextMenuShortcutPressed_ = true;
        }
    };
}

public void SetContextMenu(PopupMenuTool popupMenuTool)
{
    if (ContextMenu != null)
    {
        ContextMenu.Dispose();
    }
    ContextMenu = new ContextMenu();
    ContextMenu.Popup += (sender, e) =>
    {
        Point screenPoint;
        if (contextMenuShortcutPressed_)
        {
            Point controlPoint;
            var activeNode = ActiveNode;
            if (activeNode != null)
            {
                var labelElement = activeNode.UIElement.GetDescendant(typeof(EditorWithTextUIElement));
                var activeNodeRect = labelElement == null ? activeNode.UIElement.Rect : labelElement.Rect;
                controlPoint = new Point(activeNodeRect.X, activeNodeRect.Y + activeNodeRect.Height / 2);
            }
            else
            {
                var rect = UIElement.Rect;
                controlPoint = new Point((rect.Left + rect.Right) / 2, (rect.Top + rect.Bottom) / 2);
            }
            screenPoint = PointToScreen(controlPoint);
        }
        else
        {
            screenPoint = MousePosition;
        }
        contextMenuShortcutPressed_ = false;
        popupMenuTool.ShowPopup(screenPoint, Rectangle.Empty, DropDownPosition.BelowExclusionRect);
    };
}

I have the same problem as malli_436. I want context menu to be shown near the active node when Shift+F10 or "Menu" keyboard key is pressed.

Is there any event like "before context menu open" where I can set the position of the context menu?