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### class spark.accessibility.RadioButtonAccImpl This is the accessibility implementation class for spark.components.RadioButton. When a Spark RadioButton is created, its accessibilityImplementation property is set to an instance of this class. The Flash Player then uses this class to allow MSAA clients such as screen readers to see and manipulate the RadioButton. See the mx.accessibility.AccImpl and flash.accessibility.AccessibilityImplementation classes for background information about accessibility implementation classes and MSAA. #### Children A RadioButton has no MSAA children. #### Role The MSAA Role of a RadioButton is ROLE_SYSTEM_RADIOBUTTON. #### Name The MSAA Name of a RadioButton is, by default, the label that it displays. When wrapped in a FormItem, this label will be combined with the FormItem's label. To override this behavior, set the RadioButton's accessibilityName property. When the Name changes, a RadioButton dispatches the MSAA event EVENT_OBJECT_NAMECHANGE. #### Description The MSAA Description of a RadioButton is, by default, the empty string, but you can set the RadioButton's accessibilityDescription property. #### State The MSAA state of a RadioButton is a combination of: * STATE_SYSTEM_UNAVAILABLE (when enabled is false) * STATE_SYSTEM_FOCUSABLE (when enabled is true) * STATE_SYSTEM_FOCUSED (when enabled is true and the RadioButton has focus) * STATE_SYSTEM_CHECKED (when selected is true) When the State changes, a RadioButton dispatches the MSAA event EVENT_OBJECT_STATECHANGE. #### Value A RadioButton does not have an MSAA Value. #### Location The MSAA Location of a RadioButton is its bounding rectangle. #### Default Action The MSAA DefaultAction of a RadioButton is "Check". When an MSAA client tells the RadioButton to perform this action, KEY_DOWN and KEY_UP MouseEvents for the SPACE key are generated, to simulate pressing the RadioButton via the keyboard, if the RadioButton is enabled. #### Focus A RadioButton accepts focus. When it does so, it dispatches the MSAA event EVENT_OBJECT_FOCUS. #### Selection A RadioButton does not support selection in the MSAA sense.