How to solve problem HFSplus OS X partition sharing as home partition in Ubuntu

I have dual-OS in my Macbook Pro, OS X Leopard and Ubuntu Oneiric. I want to share partition between OS X and Ubuntu. I use hfplus partition (without journaled) as user home in Ubuntu Oneiric. Then the problem begin.

When I adding launcher in Desktop (Ubuntu), it can’t be executed and throw error :

the application launcher ".desktop" has not been marked as trusted. if you do not know the source of this file, launching it may be unsafe.

After finding several articles, I try to change UID in this partition (/dev/sda3) into 501 :

But it still doesn’t works. Using “chmod a+x” on *.desktop, chown ubuntu:ubuntu, allow permission in properties and another tricks giving no results.
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