Kdesu and sudoers file

In my sudoers file I have an entry:
myusername ALL = NOPASSWD: /home/myusername/bin/myguiprogram
I set up a link to an application on the desktop and specify as the command line:
kdesu /home/myusername/bin/myguiprogram
Yet when I start the application it still asks me for a password before it executes the program. Why ?
myusername ALL = NOPASSWD: /home/myusername/bin/myguiprogram
I set up a link to an application on the desktop and specify as the command line:
kdesu /home/myusername/bin/myguiprogram
Yet when I start the application it still asks me for a password before it executes the program. Why ?