XError BadAccess with gdk_window_set_events

[Tobias Henle <tobias page23 de>]

Hello List,

_Sorry_ for the second try but i have had the wrong sender adress :(

I have a problem with the function gdk_window_set_events in gtk2.
I want to recive events from the root window and using set_events function 
results in an XError. I wrote a short code example to reproduce this error.

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#include <gtk/gtk.h>
#include <gdk/gdkx.h>

int main(int argc, char *argv[])
{
  GdkWindow     *root_window;

  gtk_init(&argc, &argv);

  root_window   = gdk_window_lookup(GDK_ROOT_WINDOW());

  g_message("1");
  gdk_window_set_events(root_window,
    GDK_BUTTON_PRESS_MASK|GDK_BUTTON_RELEASE_MASK);
  g_message("2");

  gtk_main();

  return 0;
};
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If i compile this code and run it i using the --sync option i get the folowing 
output:

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(tobias=hal9000=src/lsiconbox/xfce_deskback)./desktop --sync
** Message: 1
The program 'desktop' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadAccess (attempt to access private resource denied)'.
  (Details: serial 51 error_code 10 request_code 2 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
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this error can be reproduced with ether gtk 2.0 or gtk 2.2.1

cya
    -toby