[Mono-list] Strange error when changing StatusIcon.Tooltip

[lordphoenix]

Hi all,
I'm trying to use a StatusIcon in my application to make a notification
icon but when I want to change the Tooltip property my application
crashes with this message : 

 Fatal IO error 11 (Ressource temporairement non disponible) on
X server :0.0.

Anyone got an idea about the problem?  
Thank for help.

PS : Sorry for my bad English I don't speak it very often…
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