`TAgg_Slider`
pl		Caption
pl		TextThickness
pl		Descending
pl		Value
pl		Steps
pl		BorderWidth
pl		BackgroundColor
pl		TriangleColor
pl		TextColor
pl		PointerPreviewColor
pl		PointerColor

`TAgg_CustomControl`
pl	ro	Align
pl	ro	Anchors
pl	ro	Color
pl	ro	ParentColor

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