| CreateEvent<T> | 
 A generic AJAX behavior event that is triggered when an item was inserted somewhere. 
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| MessageListenerEvent | 
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| PlaceholderModifyActiveGroupsEvent | 
 Event data that may be used when the a different set of groups of placeholders should be shown in the placeholder
 dialog. 
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| PlaceholderModifyLibraryEvent | 
 Event data that may be used when the registered placeholders should be changed or modified. 
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| PlaceholderProjectContextChangedEvent | 
 Event data that may be used when the selected project for the placeholder dialog has changed. 
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| PlaceholderUpdateActiveGroupsEvent | 
 This event changes the active placeholder groups by adding and removing the given groups. 
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| PlaceholderUpdateLibraryEvent | 
 This event changes the registered placeholders of a certain group by adding and removing the given placeholders. 
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