Install Grub in separate partition

Hello,
I was trying to install kali linux 2 with full disk encryption. But an error message was shown that grub is not installed(I think its a similer bug: https://bugs.kali.org/view.php?id=1260). So i install the system without grub and lilo. Then I tried to install grub with live kali. But i dont know how to do it. I tried some method but most of them were to reinstalling grub not fresh installing. Info about systems:
1. Version: Kali Linux 2 (Standard ISO - 3.09GB)
2. Partition Details: /dev/sda1 - crypt-luks (root, home, swap)
/dev/sda2 - ext4 (I created this during partition for using it as boot partition)
unallocated (I leave some space for installing windows later)
I want to install grub in /dev/sda2 and attached it with root partition on /dev/sda1 which is encrypted and wouldn't open from live image).

So Any kinds of suggestion or instruction would be helpful...
Thanks..

if I understand correctly you don't have any system on your hdd?
in this situation is much easier and w/o possible errors first to install Windows system and after that Kali Linux.
how to install Kali read this two posts:
https://forums.kali.org/showthread.p...-Kali-2-0-Sana
https://forums.kali.org/showthread.p...Kali-2-0-error
and before that I suggest you to wipe whole hdd with dban