| ClassVisibleToUser | Determines if the ObjectClass is visible to the current user session. |
| Expand | Expands the placeholder level based on the given context. |
| GetClientCommandGenerator | |
| GetClientDefinitions | |
| GetResolvedStructureReferences | Provides all structure references that exist and were resolved in this placeholder level. |
| GetSupportedTypes | |
| Init | Initializes the handler for a specific placeholder level. Sets the level, and performs base validation and kicks off custom initialization. |
| Initialize | Performs custom initialization. |
| ObjTypeVisibleToUser | Determines if the ObjType is visible to the current user session. |
| PropertyVisibleToUser | Determines if the PropertyDef is visible to the current user session. |
| ValueListItemVisibleToUser | Determines if the ObjectClass is visible to the current user session. |