When I upgrades to v3.0.2, why I lose navigation bar of NGUI

[POPOao]

After importing the "v 3.0.2", the navigation bar is missing.

--2. If you are working with an existing project that was using NGUI 2.7.0 or
   earlier, but don't mind spending some time upgrading it to use the latest
   version's features, import the "NGUI v.3.0.2" unity package as well,
   but ONLY AFTER BACKING UP YOUR CURRENT PROJECT!! This version will have
   all the latest features and fixes, but it is NOT BACKWARDS COMPATIBLE
   due to the sheer amount of stuff changed/added in NGUI 3.

After import the "v3.0.2", the navigation bar is lose.
My previous version was v2.6.4, and directory structure is "Assets/ThirdPart/NGUI".

[Darkmax]

you need to update your project check this video: http://www.youtube.com/watch?v=uNSZsMnhS1o

[ArenMook]

Indeed. And should also read http://www.tasharen.com/forum/index.php?topic=6328.0

[POPOao]

you need to update your project check this video: http://www.youtube.com/watch?v=uNSZsMnhS1o

3Q it's helpful