FYI
I have noticed that the layout engine for notesuiworkspace.picklistcollection does not handle long prompt strings very well when running in client (have not tested on the web). If your prompt string is long and the screen is not at high resolution the OK and Cancel buttons get pushed out of view in the dialog frame. If you reduce the window width it fixes itself, but upon initial opening, only the leftmost few pixels of the buttons are visible. I observed this condition at a screen resolution of 1024x768 with a prompt string of about 150 characters.