Modifying applescript to use it in Quicksilver

[Chris Cairns]

Here is a simple applescript that changes the label colour of a  
selected item in Finder.
tell application "Finder"
        set thisItem to selection as alias
        set the label index of thisItem to 3 -- 3 = Yellow
end tell
Does anyone know how to modify it to change the colour of an item in  
Quicksilver's first pane?
Something like--- have the item in first pane and "change label  
colour" applescript in the actions pane.
Thanks.