texture image not rotating with nurb surface
 

Hi,

I'm new to 3D. Here is my problem:

https://drive.google.com/open?id=0B9...TUtNmVfMDRnME0

I have pasted a jpg to a nurb surface, and it is grouped with another two nurb surfaces. It is fine when I rotate that surface itself, but when I rotate the group, the texture seems to change orientation when it is rotated over 45 degrees.

What can I do? thanks.

Terry