2 accel-group -- 2.6 (except some functions which are probably not very useful)
4 accel-map -- 2.6 (except some functions which are probably not very useful)
6 adjustment -- defined by introspection
8 arrow -- defined by introspection
9 aspect-frame -- defined by introspection
13 button-box -- defined by introspection
16 check-button -- defined by introspection
17 check-menu-item -- 2.6
18 color-button -- defined by introspection
19 color-selection -- 2.6 minus palette
20 color-selection-dialog -- 2.8
22 combo-box-entry -- 2.6
25 drawing-area -- defined by introspection
28 entry-completion -- 2.8
29 event-box -- defined by introspection
30 expander -- defined by introspection
32 file-chooser-button -- defined by introspection (but the dialog property should be readable)
33 file-chooser-dialog -- defined by introspection
34 file-chooser-widget -- defined by introspection
38 font-button -- defined by introspection
42 h-box -- defined by introspection
43 h-button-box -- defined by introspection
44 h-paned -- defined by introspection
45 h-ruler -- defined by introspection
46 h-scale -- defined by introspection
47 h-scrollbar -- defined by introspection
48 h-separator -- defined by introspection
50 image-menu-item -- 2.6
59 menu-bar -- defined by introspection, 2.8
62 menu-tool-button -- 2.6
69 radio-menu-item -- 2.6
70 radio-tool-button -- 2.6
74 scrollbar -- defined by introspection
75 scrolled-window -- 2.8
76 separator -- defined by introspection
77 separator-menu-item -- defined by introspection
78 separator-tool-item -- defined by introspection
85 tearoff-menu-item -- defined by introspection
86 text-buffer -- 2.6 (but the API may change)
89 text-tag -- 2.6 minus text-attributes
92 toggle-button -- defined by introspection
93 toggle-tool-button -- 2.6
96 tool-item -- 2.6 (except initialize-instance)
99 viewport -- defined by introspection
100 v-box -- defined by introspection
101 v-button-box -- defined by introspection
102 v-paned -- defined by introspection
103 v-ruler -- defined by introspection
104 v-scale -- defined by introspection
105 v-scrollbar -- defined by introspection
106 v-separator -- defined by introspection
107 widget -- 2.6 (more or less)