`TplSquareButton`
pl		Caption
pl		Color
pl		ColorBorder
pl		Enabled
pl		ColorOverCaption
pl		Alignment
pl		ColorOverBorder
pl		BorderWidth
pl		DownBorderColor
pl	ro	ShowHint
pl	ro	ParentShowHint
pl	ro	Font
pl	ro	Align
pl	ro	ParentColor
pl	ro	ParentFont
pl	ro	Visible
pl	ro	Anchors
pl		BiDiMode
pl	ro	Constraints
pl	ro	DragKind
pl	ro	ParentBiDiMode

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