Ignore the key command. This is a script that @pianopaul had previously posted:
Use a button widget on the global rackspace, give it the handle/name ''BUTTON" in the widget properties Advanced tab, and then paste the below code into the Global Rackspace Script Editor (Window menu). Click Compile at the bottom before closing the script editor window.
var BUTTON : Widget
On WidgetValueChanged (newValue : double) from BUTTON
if newValue == 1.0 then
ShowChordProWindow(true)
else
ShowChordProWindow(false)
end
end