I find GtkEntry has a default context menu
But I really do not want it, how can I disable it
I googled but no effective way found
Did you try to just hide/unref/destroy the wigdet passed (the GtkMenu being spawned) within a signal handler hooked to populate-popup?
Another option would be to filter out all right click events by hooking up to GtkWidget's (actually yout GtkEntry which is a subclass of GtkWidget) clicked signal and returning TRUE (for being handled)