This inheritance list is sorted roughly, but not completely, alphabetically:
ABool
AboutData
AboutDialog
AboutPerson
AccountDialog
AccountGraphicsProxyWidget
AccountingModel
AccountingRecord
AccountingRecordWidget
AccountingRecordWidgetType
AccountModel
AccountsTableDelegate
AccountsTableDialog
AccountsTableFilterModel
AccountsTableHeaders
AccountsTableModel
AccountStyle
AComboBox
ALineEdit
ATitleWidget
BugReportDialog
DataAccountingRecord
DataBasicAccount
DataAccount
DataTableAccount
DataChapter
DataExercise
DataExerciseValidator
DataFolderHistory
DataHash
DataProject
DateCalendar
DescriptionWidget
ExerciseDelegate
ExerciseFilterModel
ExerciseItem
ExerciseModel
ExerciseTreeView
ExerciseView
FileType
Help
HelpBrowserDialog
HelpSortFilterProxyModel
HistoryModel
KLineEdit
KLineEditButton
MailerThread
MailSender
MainWindow
ManifestData
ManifestOsInfo
ManifestParser
NewDocumentDialog
OpeningStockWidget
OperatingSystems
PieChartView
PrintDialog
Printing
PrintPreviewDialog
AboutPerson::Private
AboutData::Private
ATitleWidget::Private
Project
ProjectInformationDialog
ProjectInformationHistoryDialog
PupilActions
SelectTableOfAccountDialog
Settings
SettingsDialog
SettingsDialogPages
StartActions
PupilStartActions
TeacherStartActions
TeacherActions
UpdaterDialog
UpdaterDownload
UpdaterThread
UpdaterManifestThread