TTrackBar
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A TTrackBar 
is a component on the Common Controls tab of the Component Palette shows a tracking bar control.
A TTrackBar contains a slider and sometimes tick marks. The TTrackBar is a scrollable control similar to the TScrollBar.
The position property of a TTrackBar represents the current value of a TrackBar control.
The min and max properties are used to set minimum and maximum limit of a TrackBar.
The orientation property determines whether the TrackBar is oriented on the horizontal or vertical axis.
The corresponding values are trHorizontal or trVertical.
The frequency property defines the distance between the tick marks along the slider.
By default the frequency is set to one.
For example, if min and max values of a TrackBar are 0 and 20.
By setting frequency to 2 means, it will take 10 steps from 0 to 20. For example, when the Pgup key is pressed
When the TrackBar controls value is changed, a onChanged event is fired.
This event can be processed to update all features linked to the TrackBar.
See also
