Main Window and Related Classes

QAction	Abstract user interface action that can be inserted into widgets
QActionGroup	Groups actions together
QDockWidget	Widget that can be docked inside a QMainWindow or floated as a top-level window on the desktop
QMainWindow	Main application window
QMdiArea	Area in which MDI windows are displayed
QMdiSubWindow	Subwindow class for QMdiArea
QMenu	Menu widget for use in menu bars, context menus, and other popup menus
QMenuBar	Horizontal menu bar
QSizeGrip	Resize handle for resizing top-level windows
QStatusBar	Horizontal bar suitable for presenting status information
QToolBar	Movable panel that contains a set of controls
QWidgetAction	Extends QAction by an interface for inserting custom widgets into action based containers, such as toolbars