evolution calendar: tooltip is modal and prevents using dialogs

In the calendar there is a problem with the tooltip showing appointments:
As long as the tooltip is shown it is not possible to use dialog windows, e.g for adding a new appointment. See attached and annotated screenshot for illustration.

To reproduce:
1) add an appointment
2) open dialog again to add another appointment
3) go with your mose over calendar entry so that tooltip is shown
4) go with your mose to "add appointment" dialog
5) try to activate a field in the dialog, e.g. Summary
6) #!# you cannot activate/add anything to the dialog as long as tooltip is shown (same applies to window functions/e.g. close with [X])

expected behaviour:
1-5) as above
6) field gets activated to enter text, dialog activated and usable

I am using gnome 3 here (no effects) on
Distributor ID: Ubuntu
Description: Ubuntu 11.10
Release: 11.10
Codename: oneiric
Linux cheal 3.0.0-17-generic #30-Ubuntu SMP Thu Mar 8 20:45:39 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

evolution:
  Installed: 3.2.2-0ubuntu0.1
  Candidate: 3.2.2-0ubuntu0.1

Thanks for looking at it.