+ *@ATK_STATE_CHECKABLE: Indicates this object has the potential to be
+ * checked, such as a checkbox or toggle-able table cell. @Since:
+ * ATK-2.12
+ *@ATK_STATE_HAS_POPUP: Indicates that the object has a popup context
+ * menu or sub-level menu which may or may not be showing. This means
+ * that activation renders conditional content. Note that ordinary
+ * tooltips are not considered popups in this context. @Since: ATK-2.12
+ *@ATK_STATE_HAS_TOOLTIP: Indicates this object has a tooltip. @Since: ATK-2.16
+ *@ATK_STATE_READ_ONLY: Indicates that a widget which is ENABLED and SENSITIVE
+ * has a value which can be read, but not modified, by the user. Note that this
+ * state should only be applied to widget types whose value is normally directly
+ * user modifiable, such as check boxes, radio buttons, spin buttons, text input
+ * fields, and combo boxes, as a means to convey that the expected interaction
+ * with that widget is not possible. When the expected interaction with a
+ * widget does not include modification by the user, as is the case with
+ * labels and containers, ATK_STATE_READ_ONLY should not be applied. See also
+ * ATK_STATE_EDITABLE. @Since: ATK-2-16