Question Regarding X environment

[Sreenivasan, Rohit G]

Hi,
 When i sudo to another user or account, i am not able to run any of the
x-(commands) like xlock,xauotlock,xdu,xcopy etc.., is this a security
feature for the sudo or is there a wrapper around this to allow users to
sudo and still be able to run the x environment.
  I am running this on Solaris 2.5 , and the Sudo version 1.5.6p6 .

Thanks,
Rohit...