Choice drop-down does not disappear when it loses focus, on XToolkit

I have an AWT application that popups a frame with a choice and a button. I am clicking on the choice and the menu drops down. Now I am pressing tab to move the focus to the next component and the focus moves to button. But the drop-down still remains and shown until the user clicks somewhere with the mouse. This is incorrect. The drop-down must disappear as soon as the focus is shifted to a different component.

This is reproducible only on XToolkit since Tiger. On Motif, clicking TAB never transfers the focus when the drop-down is visible. On Win32, pressing tab makes the drop-down disappear. This is reproducible on Mustang-b26 also.

I have attached a sample test. Execute the sample test on Solaris/ Linux. You would see a frame. Click on the choice. The drop-down will appear. Now press TAB. If the focus gets transferred to button and the drop-down is still shown, the bug is reproduced.
###@###.### 2005-03-13 16:32:26 GMT