Occurs when the button's checked state is changed.
The CheckedChanged event's data class is EventArgs.
Write a handler for the CheckedChanged event to perform any custom actions in response to the button's checked state being changed.
The CheckedChanged event's generation depends upon the settings of the ASPxButton.AutoPostBack property and the ASPxClientProcessingModeEventArgs.processOnServer property passed to the corresponding client ASPxClientButton.CheckedChanged event, if it is handled. refer to the descriptions of these properties for more information.