Rhel 7 grub loader is not showing windows 7 entry

Hi Experts,

I have installed RHEL 7 kernel 3.10.0-121 on my desktop pc for evaluation purpose.I have installed the OS on one single partition (/dev/sda4) for dual booting rhel with windows 7. However after installing rhel I am unable to find windows entry in grub loader and unable to boot windows 7. Tried to update grub2 loader by grub2-mkconfig command but no hope.

In fdisk command o/p, I am able to see 100mb ntfs boot partition and windows C drive partition,but not able to boot.

I am unable to find any useful resolution on web. Can any one help me on this..

Partition Details:

/dev/sda1 - 100MB windows
/dev/sda2 - windows c drive
/dev/sda3 - Extended Partition
/dev/sda4 - Rhel 7 Linux partition
/dev/sda5 - Extended windows partition