Multi Layout Region - Setting Navigation Elements

[Hanbill]

I have created Default Multi Layout Regions and want to navigate between them. I have followed the help topic "Setting Navigation Elements" and used the example given. I get to the stage of "selecting" which Layout Region to "switch to" from the choice in the combo box but the validate button does not become active ... in other words I cannot click it. So clicking OK to close the parameter values dialog saves everything but the action does not work.

If anyone can help it would be appreciated. I've tried this in both NOF 11 and NOF 12. I'm using Windows 7 64bit and running NOF as an Administrator

See attachment for an example ... note that neithr the "tick" box or "X" box are enabled.

Thanks.