Bookmark menu at the left edge of browser window

[whileloop]

Sorry, my previous posts may be a little inaccurate.
Steps to reproduce the issue:
1) Start CentBrowser and enable the option to show bookmark menu when mouse cursor is near the left edge of window.
2) Start another program (eg. notepad) and put it in front of the CentBrowser window but do not block the left edge of CB window.
3) Move mouse cursor near the left edge of CB window. The bookmark menu will popup event when CB window is not the active window.
4) The bookmark menu will not disappear as long as CB window is inactive. (Eg. clicking on the active program, starting other programs from taskbar or start menu, pressing ALT+TAB or WIN+TAB to activate other programs)
5) Activate CB window by clicking on it or its taskbar icon or by minimizing all other windows or by ALT+TAB. Then the bookmark menu will disappear.

The key point is that mouse pointer trigger CB to display bookmark menu when CB is inactive.
And this bookmark menu won't disappear untill CB window is activated. (except the show desktop command)