Officially rooted HTC, denies su permission in Android Emulator app officially rooted from htcdev.com, I followed the instructions step by step and had the screen confirmation that my phone (HTC Sensation XL) is rooted.

Now when trying to gain super user access through "Android emulator", "Superuser", "Super manager" the permission is denied or the apps cannot detect if the device has been rooted.

I want to know why root access is denied after the device has been rooted successfully and how to fix this issue, am I missing extra steps or additional settings?
Thanks to "eldarerathis" for the comment. Basically unlock bootloader does not mean you will have root access to your device. Even though you can install an entire new operating system still rooting your phone must be done inside the OS.

So if you trying to root your HTC device check unrevoked.com. for other devices I found a reliable tutorial at http://howto.cnet.com/8301-11310_39-20054428-285/how-to-root-your-android/.

please note unlock bootloader or rooting your device may void your warrantee.