Refreshing Transmit session

I’m writing a script that includes refreshing a session in Transmit but somehow it wouldn’t refresh though it didn’t return any error. Here’s the script:

tell application "Transmit"
	tell current session of front document
		set sel_ to their stuff selection
		set mode_ to the text returned of (display dialog "enter mode" default answer "") as text
		set name_ to the text returned of (display dialog "enter name of the new folder" default answer "") as text
		set cmd_ to "mkdir -m " & mode_ & " " & sel_ & "/" & name_ as text
		tell application "Terminal"
			do script cmd_ in front window
		end tell
		-- refreshing
		refresh list their stuff selection
		--
	end tell
end tell

Where did I do wrong?

Model: G4
AppleScript: AppleScript 1.10.3
Browser: Safari 417.8
Operating System: Mac OS X (10.4)