`tdbdropdowncols`
	ro	items

`tnolistdropdowncols`

`tdropdowncols`
		nostreaming
		onitemchange
	ro	items
pl		width
pl		options
pl		textflags
pl		linewidth
pl		linecolor
pl		color
pl		colorselect
pl		font
pl		fontselect
pl		frametemplate
pl		facetemplate

`tdropdowndatacols`
		rowcount
	ro	items

`townedpersistentarrayprop`

`tpersistentarrayprop`
	ro	itemclasstype
	ro	items

`tarrayprop`
		fixcount
		onchange
pl		count