After some point I formatted partition with VMware because my windows install disk didn't show the format option, the Icon appeared in the Startup Disk Pane, but after installing drivers and back to Mac OS the icon in that pane disappeared.
Booting back to windows is easy with keyboard or by a comand line in Terminal, but does anyone has a trick to make the Boot Camp Icon appear in the Startup Disk again?
EDIT:
Never mind, I read that some users that use mac fuse suffer from this issue too.
I installed Paragon's NTFS for Mac, but turning it off resolves the issue