How to set the "window" widget's border to zero

["chao yeaj" <yeajchao gmail com>]

Hello everyone

     You know, the gtk_container_set_border_width function can set
the border's width of container

    but  ,when i use this function to set my application's main
window's border to zero ,
   I failed

     I want my main window  has no  border ,how to achieve this ?

    I need your help

Any comments would be much appreciated,and thanks in advance  !