| Class | Description | 
|---|---|
| PlaceholderModifyActiveGroupsEvent | 
 An event that may be triggered when the a different set of groups of placeholders should be shown in the placeholder
 dialog. 
 | 
| PlaceholderModifyLibraryEvent | 
 An event that may be triggered when the registered placeholders should be changed or modified. 
 | 
| PlaceholderUpdateActiveGroupsEvent | 
 This event changes the active placeholder groups by adding and removing the given groups. 
 | 
| PlaceholderUpdateLibraryEvent | 
 This event changes the registered placeholders of a certain group by adding and removing the given placeholders. 
 | 
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