[Closed] Execute string command?

When I select any object and put “showProperties $” I have a list of properties, I load those properties as strings into the listBox and then I would like to let user select one property and execute something like $.that_property = undefined (for example) where “that_property” is only string. Any ideas how to do it?

example:

try(destroyDialog raypro) catch()
rollout test1 "test" 
(
	listbox lbx
	button loadbut "LoadProperties"
	
	fn getPropToArr obj =
	(
		cp = StringStream ""
		showProperties (obj) to:cp
		sstr = cp as string
		arrayp = #()
		str = ""
		for i in 1 to sstr.count do
		(
			c = sstr[i]
			if c != "
" then
				str += sstr[i]
			else
			(
				append arrayp str
				str = ""
			)
		)
		return arrayp
	)
	
	local arr = #()
	
	on loadbut pressed do
	(
		arr = getPropToArr $
		lbx.items = (for o in arr collect o as string)
	)
)
createdialog test1 width:400 height:200