Basic Controls
These basic controls are meant for direct use.  There are also some abstract widget classes, meant for
subclassing, and some more complex widgets.
Classes:
- QCheckBox
    (Check box with a text label)
- QComboBox
    (Combined button and popup list)
- QDial
    (Rounded rangecontrol (like a speedometer or potentiometer))
- QLCDNumber
    (Displays a number with LCD-like digits)
- QLabel
    (Static information display)
- QLineEdit
    (One-line text editor)
- QPopupMenu
    (Popup menu widget)
- QPushButton
    (Command button)
- QRadioButton
    (Radio button with a text label)
- QScrollBar
    (Vertical or horizontal scroll bar)
- QSizeGrip
    (Corner-grip for resizing a top level window)
- QSlider
    (Vertical or horizontal slider)
- QSpinBox
    (Spin box widget, sometimes called up-down widget, little arrows widget or spin button)
- QTextView
    (A sophisticated single-page rich text viewer)
- QToolButton
    (Quick-access button to specific commands or options, usually used inside a QToolBar)
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