Here is a list of all documented files with brief descriptions:

CGTK.h
CGTK.m
CGTKAboutDialog.h
CGTKAboutDialog.m
CGTKAccelLabel.h
CGTKAccelLabel.m
CGTKActionBar.h
CGTKActionBar.m
CGTKAlignment.h
CGTKAlignment.m
CGTKAppChooserButton.h
CGTKAppChooserButton.m
CGTKAppChooserDialog.h
CGTKAppChooserDialog.m
CGTKAppChooserWidget.h
CGTKAppChooserWidget.m
CGTKApplicationWindow.h
CGTKApplicationWindow.m
CGTKArrow.h
CGTKArrow.m
CGTKAspectFrame.h
CGTKAspectFrame.m
CGTKAssistant.h
CGTKAssistant.m
CGTKBase.h
CGTKBase.m
CGTKBaseBuilder.h
CGTKBaseBuilder.m
CGTKBin.h
CGTKBin.m
CGTKBox.h
CGTKBox.m
CGTKBuilder.h
CGTKBuilder.m
CGTKButton.h
CGTKButton.m
CGTKButtonBox.h
CGTKButtonBox.m
CGTKCalendar.h
CGTKCalendar.m
CGTKCallbackData.h
CGTKCallbackData.m
CGTKCellView.h
CGTKCellView.m
CGTKCheckButton.h
CGTKCheckButton.m
CGTKCheckMenuItem.h
CGTKCheckMenuItem.m
CGTKColorButton.h
CGTKColorButton.m
CGTKColorChooserDialog.h
CGTKColorChooserDialog.m
CGTKColorChooserWidget.h
CGTKColorChooserWidget.m
CGTKColorSelection.h
CGTKColorSelection.m
CGTKColorSelectionDialog.h
CGTKColorSelectionDialog.m
CGTKComboBox.h
CGTKComboBox.m
CGTKComboBoxText.h
CGTKComboBoxText.m
CGTKContainer.h
CGTKContainer.m
CGTKDialog.h
CGTKDialog.m
CGTKDrawingArea.h
CGTKDrawingArea.m
CGTKEntry.h
CGTKEntry.m
CGTKEventBox.h
CGTKEventBox.m
CGTKExpander.h
CGTKExpander.m
CGTKFileChooserButton.h
CGTKFileChooserButton.m
CGTKFileChooserDialog.h
CGTKFileChooserDialog.m
CGTKFileChooserWidget.h
CGTKFileChooserWidget.m
CGTKFixed.h
CGTKFixed.m
CGTKFlowBox.h
CGTKFlowBox.m
CGTKFlowBoxChild.h
CGTKFlowBoxChild.m
CGTKFontButton.h
CGTKFontButton.m
CGTKFontChooserDialog.h
CGTKFontChooserDialog.m
CGTKFontChooserWidget.h
CGTKFontChooserWidget.m
CGTKFontSelection.h
CGTKFontSelection.m
CGTKFontSelectionDialog.h
CGTKFontSelectionDialog.m
CGTKFrame.h
CGTKFrame.m
CGTKGLArea.h
CGTKGLArea.m
CGTKGrid.h
CGTKGrid.m
CGTKHandleBox.h
CGTKHandleBox.m
CGTKHBox.h
CGTKHBox.m
CGTKHButtonBox.h
CGTKHButtonBox.m
CGTKHeaderBar.h
CGTKHeaderBar.m
CGTKHPaned.h
CGTKHPaned.m
CGTKHScale.h
CGTKHScale.m
CGTKHScrollbar.h
CGTKHScrollbar.m
CGTKHSeparator.h
CGTKHSeparator.m
CGTKHSV.h
CGTKHSV.m
CGTKIconView.h
CGTKIconView.m
CGTKImage.h
CGTKImage.m
CGTKImageMenuItem.h
CGTKImageMenuItem.m
CGTKInfoBar.h
CGTKInfoBar.m
CGTKInvisible.h
CGTKInvisible.m
CGTKLabel.h
CGTKLabel.m
CGTKLayout.h
CGTKLayout.m
CGTKLevelBar.h
CGTKLevelBar.m
CGTKLinkButton.h
CGTKLinkButton.m
CGTKListBox.h
CGTKListBox.m
CGTKListBoxRow.h
CGTKListBoxRow.m
CGTKLockButton.h
CGTKLockButton.m
CGTKMenu.h
CGTKMenu.m
CGTKMenuBar.h
CGTKMenuBar.m
CGTKMenuButton.h
CGTKMenuButton.m
CGTKMenuItem.h
CGTKMenuItem.m
CGTKMenuShell.h
CGTKMenuShell.m
CGTKMenuToolButton.h
CGTKMenuToolButton.m
CGTKMessageDialog.h
CGTKMessageDialog.m
CGTKMisc.h
CGTKMisc.m
CGTKModelButton.h
CGTKModelButton.m
CGTKNotebook.h
CGTKNotebook.m
CGTKOffscreenWindow.h
CGTKOffscreenWindow.m
CGTKOverlay.h
CGTKOverlay.m
CGTKPaned.h
CGTKPaned.m
CGTKPlacesSidebar.h
CGTKPlacesSidebar.m
CGTKPopover.h
CGTKPopover.m
CGTKPopoverMenu.h
CGTKPopoverMenu.m
CGTKProgressBar.h
CGTKProgressBar.m
CGTKRadioButton.h
CGTKRadioButton.m
CGTKRadioMenuItem.h
CGTKRadioMenuItem.m
CGTKRadioToolButton.h
CGTKRadioToolButton.m
CGTKRange.h
CGTKRange.m
CGTKRecentChooserDialog.h
CGTKRecentChooserDialog.m
CGTKRecentChooserMenu.h
CGTKRecentChooserMenu.m
CGTKRecentChooserWidget.h
CGTKRecentChooserWidget.m
CGTKRevealer.h
CGTKRevealer.m
CGTKScale.h
CGTKScale.m
CGTKScaleButton.h
CGTKScaleButton.m
CGTKScrollbar.h
CGTKScrollbar.m
CGTKScrolledWindow.h
CGTKScrolledWindow.m
CGTKSearchBar.h
CGTKSearchBar.m
CGTKSearchEntry.h
CGTKSearchEntry.m
CGTKSeparator.h
CGTKSeparator.m
CGTKSeparatorMenuItem.h
CGTKSeparatorMenuItem.m
CGTKSeparatorToolItem.h
CGTKSeparatorToolItem.m
CGTKSignalConnector.h
CGTKSignalConnector.m
CGTKSignalData.h
CGTKSignalData.m
CGTKSpinButton.h
CGTKSpinButton.m
CGTKSpinner.h
CGTKSpinner.m
CGTKStack.h
CGTKStack.m
CGTKStackSidebar.h
CGTKStackSidebar.m
CGTKStackSwitcher.h
CGTKStackSwitcher.m
CGTKStatusbar.h
CGTKStatusbar.m
CGTKSwitch.h
CGTKSwitch.m
CGTKTable.h
CGTKTable.m
CGTKTearoffMenuItem.h
CGTKTearoffMenuItem.m
CGTKTextView.h
CGTKTextView.m
CGTKToggleButton.h
CGTKToggleButton.m
CGTKToggleToolButton.h
CGTKToggleToolButton.m
CGTKToolbar.h
CGTKToolbar.m
CGTKToolButton.h
CGTKToolButton.m
CGTKToolItem.h
CGTKToolItem.m
CGTKToolItemGroup.h
CGTKToolItemGroup.m
CGTKToolPalette.h
CGTKToolPalette.m
CGTKTreeView.h
CGTKTreeView.m
CGTKTypeWrapper.h
CGTKTypeWrapper.m
CGTKVBox.h
CGTKVBox.m
CGTKVButtonBox.h
CGTKVButtonBox.m
CGTKViewport.h
CGTKViewport.m
CGTKVolumeButton.h
CGTKVolumeButton.m
CGTKVPaned.h
CGTKVPaned.m
CGTKVScale.h
CGTKVScale.m
CGTKVScrollbar.h
CGTKVScrollbar.m
CGTKVSeparator.h
CGTKVSeparator.m
CGTKWidget.h
CGTKWidget.m
CGTKWindow.h
CGTKWindow.m