GTK_WINDOW_POPUP

Ok so the documentation for GtkWindowType states:

"Nearly all windows should be GTK_WINDOW_TOPLEVEL. In particular, do not use GTK_WINDOW_POPUP just to turn off the window borders; use gtk_window_set_decorated() for that."
 
So i think I might go ahead and chnge it to TOPLEVEL and see later wether the border needs to be removed or not.