renderer_attach = gtk_cell_renderer_pixbuf_new ();
renderer_priority = gtk_cell_renderer_pixbuf_new ();
renderer_header = gtk_cell_renderer_text_new ();
renderer_attach = gtk_cell_renderer_pixbuf_new ();
renderer_priority = gtk_cell_renderer_pixbuf_new ();
renderer_header = gtk_cell_renderer_text_new ();