`TfpgGDIWindow`
pt	ro	WinHandle

`TfpgWindowBase`
	ro	HasHandle
		WindowType
		WindowAttributes
		Left
		Top
		Width
		Height
		MinWidth
		MinHeight
		MaxWidth
		MaxHeight
	ro	Canvas
		Parent
		MouseCursor

`TfpgComponent`
		TagPointer
pl		HelpContext
pl		HelpKeyword
pl		HelpType