Graphics in postgress using GTK

Hi
We are trying to implement a progress estiamator for long queries. We 
are trying to make the display graphical using GTK but we get an error 
saying
Xlib : Connection to ":0.0" refused by server
xlib : no protocol specified

GTK-warning ** : Cannot open display

Can someone suggest a method to integrate this GTK code into postgres 
and solve this problem.

Thanks and Regards
Anuj Tripathi