no aparece grub con gpt windows/ubuntu

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http://askubuntu.com – I have an asus k55VM. The problem is that once done the partitions to install windows 7 finalize you and then ubuntu 12.10 the grub not to appear. On having created the table of partitions with gparted I did it in format msdos but then on having installed windows gently accepted me and he says to me that I must do it with format gpt therefore I erase the disc in the assistant of installation and believe a partition of 160 gb Later between with live CD to ubuntu and believe other partitions between which, one ext4 for ubuntu... I install and restart. On having restarted the grub does not go o (HowTos)