class TGVSlider: public TGSlider

TGSlider, TGVSlider and TGHSlider

Slider widgets allow easy selection of a range.
Sliders can be either horizontal or vertical oriented and there is
a choice of two different slider types and three different types
of tick marks.

TGSlider is an abstract base class. Use the concrete TGVSlider and
TGHSlider.

Dragging the slider will generate the event:
kC_VSLIDER, kSL_POS, slider id, position  (for vertical slider)
kC_HSLIDER, kSL_POS, slider id, position  (for horizontal slider)

Pressing the mouse will generate the event:
kC_VSLIDER, kSL_PRESS, slider id, 0  (for vertical slider)
kC_HSLIDER, kSL_PRESS, slider id, 0  (for horizontal slider)

Releasing the mouse will generate the event:
kC_VSLIDER, kSL_RELEASE, slider id, 0  (for vertical slider)
kC_HSLIDER, kSL_RELEASE, slider id, 0  (for horizontal slider)