Icon to launch app as root?

[Steve]

Is there a way to modify an application icon so that it will launch as 
root, and therefore prompt for password?

I'm using Ubuntu Hoary (Gnome), and want to modify an app's icon so that 
it will be "sudo <blahblah>". I tried changing the Commandline in the 
icon's properties to this, but that doesn't work.

I suspect either it is very easy, or impossible... :-)

Thanks for any help.

-Steve.
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