problem with gtk_list_store_set

["Mrad James Deane" <xtremejames183 msn com>]

Hello , i got a little problem with this fuction , when i try to add a new 
item to the list , it erase the last one , in final i got one item in my 
list , and i want 5 items for example , this a piece of the code:

if(gtk_spin_button_get_value(GTK_SPIN_BUTTON(moy))>9.26)
{
strcpy(success,"Successed") ;
pass=TRUE;
}
else {
    strcpy(success,"Dismissed");
    pass=FALSE;
    }
gtk_list_store_set(store,&iter,
STUDENT_COLUMN,gtk_entry_get_text(GTK_ENTRY(name)) ,
MOY_COLUMN,gtk_spin_button_get_value(GTK_SPIN_BUTTON(moy)),
PASS_COLUMN,pass,
MENTION_COLUMN,success,
-1);
Please help

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