Menubar: In IE if clicked in menu text, dropdown disappears

Menubar: In IE if clicked in menu text, dropdown disappears

Steps to reproduce:

1. Run  tests\visual\menu\menubar.html  test from GIT master  in Internet Explorer 8
2. Click in File

Observed:

dropdown menu is closed if mouse button is released

Expected:

dropdown menu remains open.

expexted behaviour occurs if clicked in button right to name or if using FireFox.

How to fix so that menubar is usable in IE also ?

Andrus.