project list too long?

Hi,

I've been using your project management system for a long time.
The version is V1.5.5.
I now have a question about the project drop down list on the left top of the page.
The projects expand and the drop down list is too long that the project of the bottom part can't be seen (in FF12 & Chrome). I check with your newest version and I see a scroll bar in the project drop down list (in FF12 & Chrome).

I also checked your track system and there's an issue which was like my symptom:
'IE7 : Project list does not scroll down' and the result field said 'Replace dijit.Menu by dijit.tooltiDialog in DropDownButton'.
I'd like to know which files are modified to have the scroll bar appear in the list?

PS. I already have some slight modification on my system that I can't upgrade to V2.3.0 since it would need lots of time to integrate/merge.

Thanks a lot for your help.

Best Regards,
Selina