| CachedRowsInfo | |
| CancelEventArgs | |
| ColumnNotAddedToColumnCollection | Column is used outside it's allowed scope |
| Comparer | This class is used to compare any two objects while gracefully handling null in either one of them. |
| DataTypeBase | The base type of any type in Firefly.Box |
| FlowAbortException | An exception that represents the need to stop the ongoing flow. |
| FromNotSetInTreeViewTaskException | Thrown if a Form containing a TreeView is attached to a UIController which does not have its From property set |
| GroupCollection | Used to monitor changes in a column's value, between deferent rows. Usually used for subtotals. |
| HandlerCollection | Represents a task's handler collection. |
| HandlerInvokeEventArgs | Provides data for the handling of an event |
| IllegalActivityException | Occurs when an activity is set to a task that contradicts the allowed activities. |
| InUIException | |
| ModuleController | |
| ModuleControllerAdvancedSettings | |
| RelationCollection | Represents the relations used by a certain task. |
| SavingRowEventArgs | |
| SortSegmentCollection | |
| StartOnRowWhereErrorEventArgs | |
| TaskCollection | Represents a collection of tasks. |
| TaskInitializationException | The base class for any error that occurs during task initialization |
| TemplateView | |
| UIOptions | Provides options for the UIController.SaveRowAndDo(ActionUIOptions) |
| ICanBeTranslatedToByteArray | |
| ITask | Represent a task in the tasks call stack |
| CancelEventHandler | |
| HandlerInvokeHandler | Represents the method that will be invoked by the Handler |
| RelationLoadHandler | Represents the method that handles the loading of data into a relation. |
| SavingRowEventHandler | |
| StartOnRowWhereErrorHandler |