Resizing a Native VHD file

Step 1.
Diskpart
select vdisk file=c:\win7.vhd
expand vdisk maximum=15360 (size is in MB !!!)
exit

Step 2.
Diskpart
select vdisk file=c:\win7.vhd
detach vdisk
exit

Step 3
Diskpart
select vdisk file=c:\win7.vhd
attach vdisk
select partition 1
extend
exit

Step 4
Diskpart
select vdisk file=c:\win7.vhd
detach vdisk
exit